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- A. S. HitchcockAlbert Spear Hitchcock (September 4, 1865 – December 16, 1935) was an American botanist an
- AbacáSpecies of flowering plant
- AbeliaGenus of flowering plants
- Abelia chinensisSpecies of flowering plant
- Abelmoschus cailleiSpecies of flowering plant
- Abelmoschus manihotSpecies of flowering plant
- Abies albaSpecies of conifer tree
- Abies amabilisSpecies of conifer
- Abies balsameaSpecies of conifer tree
- Abies concolorSpecies of conifer tree
- Abies grandisSpecies of conifer tree
- Abies homolepisSpecies of fir tree
- Abies koreanaSpecies of plant (Korean fir)
- Abies milleriSpecies of conifer
- Abies nordmannianaSpecies of conifer tree
- Abies numidicaSpecies of conifer
- Abies pinsapoSpecies of tree
- Abies proceraSpecies of conifer
- Abies religiosaSpecies of conifer
- Abies sibiricaSpecies of conifer
- Abronia fragransPlant species in the four o'clock family
- Abronia umbellataAbronia umbellata (pink sand verbena) is a flowering annual plant which is native to weste
- Abrothallus parmeliarumAbrothallus parmeliarum is a species of lichenicolous fungus. It grows on the thallus and
- Abrus precatoriusSpecies of flowering plant in the bean family
- AbscissionShedding of various parts of an organism
- Absorption of waterLife process in plants
- AbundisporusGenus of fungi
- AbutaGenus of flowering plants
- AbutilonGenus of flowering plants
- Abutilon menziesiiSpecies of flowering plant
- Abutilon palmeriSpecies of shrub
- Abutilon theophrastiPlant species in the mallow family
- AcaciaGenus of plants
- Acacia acuminataSpecies of plant
- Acacia aneuraSpecies of shrub or small tree
- Acacia auriculiformisSpecies of legume
- Acacia baileyanaSpecies of shrub
- Acacia bivenosaAcacia bivenosa, commonly known as two-nerved wattle, two-veined wattle or hill umbrella b
- Acacia cognataSpecies of legume
- Acacia coleiSpecies of legume
- Acacia confusaSpecies of plant
- Acacia dealbataSpecies of flowering plant
- Acacia decurrensSpecies of legume
- Acacia koaSpecies of flowering tree endemic to the Hawaiian Islands
- Acacia mearnsiiSpecies of flowering plant
- Acacia melanoxylonSpecies of legume
- Acacia pravissimaSpecies of legume
- Acacia pycnanthaGolden wattle of southeastern Australia
- Acacia retinodesSpecies of legume
- Acacia salicinaSpecies of plant
- Acacia sensu latoGenus of legumes
- Acacia stenophyllaSpecies of tree
- Acaciella angustissimaSpecies of plant
- AcaenaGenus of flowering plants
- Acaena magellanicaSpecies of plant
- Acaena microphyllaAcaena microphylla, the bidibid or piripiri, and outside New Zealand, New Zealand-bur, is
- Açaí palmPalm tree with many uses, mainly fruit as cash crop
- AcalyphaGenus of flowering plants
- Acalypha chamaedrifoliaSpecies of flowering plant
- Acalypha hispidaFlowering shrub
- Acalypha indicaSpecies of flowering plant
- Acalypha wilkesianaSpecies of flowering plant
- AcanthaceaeFamily of flowering plants comprising the acanthus
- AcanthoecidaeAcanthoecidae is a family of choanoflagellates. Its subgroups Diaphanoeca and Stephanoeca
- AcanthophoenixGenus of palms
- Acanthophoenix rubraSpecies of palm
- AcanthosicyosGenus of flowering plants
- Acanthosicyos horridusSpecies of melon
- Acanthosicyos naudinianusSpecies of melon endemic to Southern Africa
- Acanthus mollisSpecies of flowering plant
- AcarosporaAcarospora is a genus of mostly lichen-forming fungi in the family Acarosporaceae. Most sp
- AcarosporaceaeFamily of fungi
- AcaulosporaGenus of fungi
- Accessory fruitBotanical category of fruit
- Accessory pigmentAccessory pigments are light-absorbing compounds, found in photosynthetic organisms, that
- Acephala groupType of Brassica plants
- Acer campestreSpecies of flowering plant
- Acer capillipesSpecies of maple
- Acer cappadocicumAcer cappadocicum, the Cappadocian maple, is a maple native to Asia, from central Turkey (
- Acer circinatumSpecies of maple
- Acer davidiiSpecies of maple
- Acer diabolicumSpecies of plant in the maple genus
- Acer griseumSpecies of maple
- Acer japonicumSpecies of maple
- Acer lobeliiSpecies of maple
- Acer macrophyllumSpecies of maple
- Acer negundoSpecies of maple
- Acer palmatumSpecies of maple
- Acer platanoidesSpecies of flowering plant in the soapberry family
- Acer pseudoplatanusSpecies of maple tree
- Acer pseudosieboldianumSpecies of maple
- Acer pycnanthumSpecies of tree
- Acer rubrumMaple tree native in North America
- Acer rufinerveAcer rufinerve, the grey-budded snake-bark-maple, redvein maple or Honshū maple (Japanese:
- Acer saccharinumSpecies of maple tree
- Acer saccharumSpecies of flowering plant
- Acer shirasawanumSpecies of maple
- Acer tegmentosumSpecies of maple
- Acer truncatumSpecies of maple
- AchariaceaeFamily of flowering plants
- AcheneClass of simple non-opening dry fruits
- AchilleaGenus of flowering plants
- Achillea ageratifoliaSpecies of yarrow
- Achillea filipendulinaSpecies of yarrow
- Achillea millefoliumSpecies of plant
- Achillea ptarmicaSpecies of flowering plant
- AchimenesGenus of flowering plants
- AchyranthesGenus of flowering plants
- Achyranthes asperaSpecies of plant
- AchyroclineAchyrocline is a genus of flowering plants in the Asteraceae described as a genus in 1838.
- Achyrocline saturejoidesSpecies of flowering plant
- AcidobacteriotaPhylum of bacteria
- Acis (plant)Acis is a genus of perennial, herbaceous and bulbous plants in the amaryllis family (Amary
- Acis autumnalisSpecies of flowering plant in the amaryllis family
- AckeeSpecies of plant
- AcmellaGenus of flowering plants
- Acmella oleraceaSpecies of flowering plant
- Acmella repensAcmella repens is a North American species of flowering plants in the family Asteraceae. T
- AcoelorrapheGenus of palms
- AconitumGenus of flowering plants in the buttercup family
- Aconitum carmichaeliiSpecies of plant
- Aconitum napellusSpecies of plant
- AcornNut of the oak tree
- AcorusGenus of aquatic plants
- Acorus calamusSpecies of plant
- AcremoniumGenus of fungi
- AcrocomiaGenus of palms
- Acrocomia aculeataSpecies of flowering plant
- AcrocordiaAcrocordia is a genus of lichen-forming fungi in the family Monoblastiaceae.
- Actaea pachypodaSpecies of plant
- Actaea racemosaSpecies of plant
- Actaea rubraSpecies of flowering plant
- Actaea simplexSpecies of plant
- Actaea spicataSpecies of plant
- ActinidiaGenus of plants native to temperate eastern Asia
- Actinidia argutaSpecies of plant
- Actinidia chinensisSpecies of plant
- Actinidia chinensis var. deliciosaSpecies of plant
- Actinidia kolomiktaSpecies of plant
- Actinidia polygamaSpecies of plant
- ActinidiaceaeFamily of flowering plants
- ActinomycetotaPhylum of bacteria
- Actinorhizal plantPlants hosting N-fixing Frankia symbionts in nodules
- ActinotusGenus of flowering plants
- Actinotus helianthiSpecies of flowering plant
- Actinotus minorActinotus minor, commonly known as the lesser flannel flower, is species of flowering plan
- Adansonia digitataSpecies of plant native to Africa
- Adansonia grandidieriSpecies of tree from Madagascar
- Adansonia gregoriiSpecies of tree
- Adansonia perrieriSpecies of flowering plant
- Adansonia zaSpecies of flowering plant
- AdeliaGenus of flowering plants
- AdelococcaceaeFamily of fungi
- Adenanthera pavoninaSpecies of legume
- AdeniaAdenia is a genus of flowering plants in the passionflower family Passifloraceae. It is di
- AdeniumGenus of flowering plants
- Adenium obesumSpecies of plant
- AdiantumGenus of ferns
- Adiantum aleuticumSpecies of fern
- Adiantum capillus-venerisSpecies of fern
- Adiantum hispidulumSpecies of fern
- Adiantum raddianumSpecies of fern
- Adiantum venustumSpecies of fern
- Adolphe-Théodore BrongniartAdolphe-Théodore Brongniart (French: ) FRS FRSE FGS (14 January 1801 – 18 February 1876) w
- Adolpho DuckeAdolpho Ducke (October 19, 1876 – January 5, 1959), (also referred to as Adolfo Ducke and
- AdromischusGenus of succulents
- Adromischus marianiaeSpecies of succulent
- Adventive plantPlants that are alien to the native flora
- Adzuki beanEast Asian crop
- AechmeaGenus of flowering plants
- Aechmea fasciataSpecies of plant
- Aechmea magdalenaeSpecies of plant
- AecidiumGenus of fungi
- AegilopsGenus of grasses
- Aegilops cylindricaSpecies of grass
- Aegilops tauschiiSpecies of grass
- Aegilops triuncialisSpecies of grass
- Aegle marmelosSpecies of tree, considered sacred by Hindus
- AegopodiumAegopodium is a plant genus of the family Apiaceae native to Europe and western Asia. It i
- Aegopodium podagrariaSpecies of flowering plant in the celery family
- Aeonium arboreumSpecies of succulent
- Aeonium haworthiiSpecies of flowering plant
- Aeonium tabuliformeSpecies of flowering plant endemic to Tenerife
- AerenchymaSpongy tissue in plants
- AeroplanktonTiny lifeforms floating and drifting in the air, carried by the wind
- AervaAerva is a genus of plants in the family Amaranthaceae. Its species are native to the pala
- Aerva javanicaSpecies of flowering plant
- Aeschynanthus longicaulisSpecies of flowering plant
- Aeschynanthus pulcherSpecies of flowering plant
- Aeschynomene asperaSpecies of plant from Tropical Asia
- Aeschynomene indicaSpecies of legume
- AesculusGenus of flowering plants
- Aesculus flavaSpecies of tree
- Aesculus glabraSpecies of tree
- Aesculus hippocastanumSpecies of tree in the soapberry family
- Aesculus indicaSpecies of plant
- Aesculus parvifloraSpecies of tree
- Aesculus paviaSpecies of tree
- Aesculus sylvaticaAesculus sylvatica, the painted buckeye, is a species of shrub. The species has five leafl
- Aesculus turbinataAesculus turbinata, common name Japanese horse-chestnut (Tochinoki or Tochi (トチノキ（栃の木） or
- Aethusa cynapiumSpecies of flowering plant in the parsley family
- Aframomum corrorimaSpecies of plant in the ginger family
- African blue basilVariety of flowering plants
- African nightshadeName for several species of flowering plant
- African swine fever virusSpecies of virus
- AfrocarpusGenus of conifers
- AfzeliaGenus of legumes
- Afzelia africanaSpecies of legume
- AgapanthoideaeAgapanthoideae is a monotypic subfamily of monocot flowering plants in the family Amarylli
- AgapanthusGenus of monocot flowering plants in the family Amaryllidaceae, order Asparagales
- Agapanthus africanusSpecies of flowering plant native to South Africa
- Agapanthus praecoxSpecies of flowering plant
- AgapetesGenus of flowering plants
- Agapetes serpensAgapetes serpens is a species of flowering plant in the heath family Ericaceae, that is na
- AgaricaceaeFamily of fungi
- AgaricalesOrder of mushrooms
- AgaricomycetesClass of fungi
- AgaricomycetidaeAgaricomycetidae is a subclass of fungi, in the division Basidiomycota. The name Agaricomy
- AgaricomycotinaSubdivision of fungi
- Agaricus aroraeAgaricus arorae is a moderate-sized, forest-dwelling mushroom that exhibits distinctive co
- Agaricus arvensisSpecies of fungus
- Agaricus augustusSpecies of fungus
- Agaricus bernardiiSpecies of agaric fungus
- Agaricus bisporusSpecies of fungus
- Agaricus bitorquisSpecies of fungus
- Agaricus campestrisSpecies of fungus
- Agaricus cupreobrunneusSpecies of fungus
- Agaricus deserticolaSpecies of fungus endemic to North America
- Agaricus dulcidulusSpecies of fungus
- Agaricus hondensisSpecies of fungus
- Agaricus semotusAgaricus semotus is a woodland mushroom of the fungus order Agaricales. Like many of its r
- Agaricus silvaticusSpecies of fungus
- Agaricus silvicolaSpecies of fungus
- Agaricus subrufescensSpecies of fungus
- Agaricus subrutilescensSpecies of fungus
- Agaricus xanthodermusSpecies of fungus
- AgaritineChemical compound
- AgarwoodFragrant wood of some Thymelaeoideae
- AgastacheGenus of flowering plants
- Agastache canaSpecies of flowering plant
- Agastache foeniculumPlant species in the mint family
- AgathisGenus of coniferous trees
- Agathis australisSpecies of coniferous tree
- AgathosmaGenus of plants from southern Africa
- Agathosma betulinaSpecies of flowering plant
- AgathoxylonAgathoxylon (also known by the synonyms Dadoxylon and Araucarioxylon) is a form genus of f
- Agave americanaSpecies of flowering plant
- Agave fourcroydesSpecies of flowering plant
- Agave macroacanthaSpecies of flowering plant
- Agave mitisAgave mitis is a plant species native to the Mexican states of Hidalgo, Tamaulipas and San
- Agave parryiSpecies of flowering plant
- Agave parvifloraSpecies of flowering plant
- Agave strictaSpecies of flowering plant
- Agave victoriae-reginaeSpecies of flowering plant
- AgavoideaeSubfamily of plants
- AgeratinaGenus of flowering plants
- Ageratina adenophoraWeedy species of flowering plant
- Ageratina altissimaSpecies of plant
- Ageratina ligustrinaSpecies of flowering plant
- AgeratumAgeratum () (whiteweed in the US) is a genus of 40 to 60 tropical and warm temperate flowe
- Ageratum conyzoidesSpecies of plant
- Ageratum houstonianumSpecies of plant
- Aglaia (plant)Genus of flowering plants
- AglaonemaGenus of flowering plants
- Aglaonema commutatumAglaonema commutatum, the poison dart plant, is a species of flowering plant in the Chines
- Aglaonema simplexSpecies of plant
- AglaophytonAglaophyton major (or more correctly Aglaophyton majus) was the sporophyte generation of a
- AglianicoVariety of grape
- Aglianico del VultureAglianico del Vulture and Aglianico del Vulture Superiore are Italian red wines based on t
- AgonisAgonis is a genus of flowering plants in the plant family Myrtaceae. All are endemic to We
- Agonis flexuosaSpecies of tree
- AgrimoniaAgrimonia (from the Greek ἀργεμώνη), commonly known as agrimony, is a genus of 12–15 speci
- Agroathelia rolfsiiPathogen fungus
- Agrobacterium tumefaciensBacterium, genetic engineering tool
- AgrocybeGenus of fungi
- Agrocybe pediadesSpecies of fungus
- Agrocybe praecoxSpecies of fungus
- Agropyron cristatumSpecies of grass
- AgrostemmaAgrostemma is a genus of annual plants in the family Caryophyllaceae, containing the speci
- Agrostemma githagoSpecies of flowering plant
- AgrostisGenus of flowering plants in the grass family
- Agrostis caninaAgrostis canina, the velvety bentgrass, brown bent or velvet bent, is a species of grass i
- Agrostis capillarisAgrostis capillaris, the common bent, colonial bent, or browntop, is a rhizomatous and sto
- Agrostis castellanaSpecies of grass
- Agrostis giganteaSpecies of grass
- Agrostis scabraSpecies of grass
- Agrostis stoloniferaSpecies of grass
- AgrostophyllumGenus of orchids
- AgrotisAgrotis is a genus of moths of the family Noctuidae. The genus was erected by Ferdinand Oc
- AgyriaceaeThe Agyriaceae are a family of lichenized fungi in the order Pertusariales. It contains tw
- Ailanthus altissimaSpecies of tree
- Aimée Antoinette CamusAimée Antoinette Camus (1 May 1879 – 17 April 1965) was a French botanist. She was best kn
- Aino HenssenAino Marjatta Henssen (12 April 1925, Elberfeld – 29 August 2011, Marburg), was a German l
- AiphanesGenus of flowering plants
- Aiphanes horridaSpecies of palm
- AizoaceaeFamily of dicotyledonous flowering plants
- AizoonAizoon or Aizoön is a genus of flowering plants in the iceplant family, Aizoaceae.
- AjugaAjuga , also known as bugleweed, ground pine, carpet bugle, or just bugle, is a genus of f
- Ajuga reptansSpecies of flowering plant
- AjwainSpecies of plant
- AkaniaceaeThe Akaniaceae or turnipwood family are a family of flowering plants in the order Brassica
- AkebiaGenus of flowering plant
- Akebia quinataSpecies of plant
- AlangiumAlangium is a small genus of flowering plants. The genus is included either in a broad vie
- Alangium chinenseSpecies of flowering plant
- Alangium salviifoliumSpecies of flowering plant
- AlbatrellaceaeThe Albatrellaceae are a family of fungi in the order Russulales. The family contains 9 ge
- AlbatrellusGenus of fungi
- Albatrellus subrubescensSpecies of fungus found in Asia, Europe and North America
- Albert Charles SmithAlbert Charles Smith (April 5, 1906 – May 23, 1999) was an American botanist who served as
- Albert Julius Otto PenzigAlbert Julius Otto Penzig, also referred to as Albertus Giulio Ottone Penzig (15 March 185
- AlbiziaGenus of flowering plants in the legume family
- Albizia julibrissinSpecies of plant
- Albizia lebbeckSpecies of legume
- Albizia proceraSpecies of tree
- AlbucaAlbuca is a genus of flowering plants in the family Asparagaceae, subfamily Scilloideae. T
- Albuca bracteataSpecies of flowering plant
- AlbugoAlbugo is a genus of plant-parasitic oomycetes. Those are not true fungi (Eumycota), altho
- Albugo candidaSpecies of single-celled organism
- AlceaGenus of flowering plants in the mallow family
- Alcea roseaSpecies of flowering plant
- Alcea setosaAlcea setosa, the bristly hollyhock, is an ornamental plant in the family Malvaceae.
- Alchemilla alpinaAlchemilla alpina, commonly known as alpine lady's-mantle, is an arctic-montane herbaceous
- Alchemilla arvensisSpecies of flowering plant
- Alchemilla mollisSpecies of flowering plant
- AlchorneaGenus of flowering plants
- Alchornea castaneifoliaAlchornea castaneifolia (iporuru, iporoni, iporuro, ipururo, ipurosa, macochihua, niando,
- Alchornea cordifoliaAlchornea cordifolia is a shrub or small tree distributed throughout tropical Africa, it c
- Alchornea glandulosaAlchornea glandulosa is a tree species of the Acalyphoideae native to South America, growi
- AldrovandaAldrovanda is a genus of carnivorous plants encompassing one extant species (Aldrovanda ve
- Aldrovanda vesiculosaSpecies of plant (waterwheel plant)
- Alectryon (plant)Genus of flowering plants
- Alectryon excelsusSpecies of flowering plant
- Aleppo pepperDried chili pepper from Syria and Turkey
- AletrisGenus of flowering plants
- Aleuria aurantiaSpecies of fungus
- AleuritesGenus of flowering plants
- Aleurites moluccanusSpecies of tree
- AleuroneTissue layer in grain seeds
- Alexander Alfonsovich GrossheimAlexander Alfonsovich Grossheim (6 March 1888 – 4 December 1948) was a Soviet botanist of
- Alexander H. SmithAlexander Hanchett Smith (December 12, 1904 – December 12, 1986) was an American mycologis
- Alexander OgstonSir Alexander Ogston KCVO MD CM LLD (19 April 1844 – 1 February 1929) was a British surgeo
- Alexander ZahlbrucknerAlexander Zahlbruckner (31 May 1860, Svätý Jur – 1938, Vienna) was an Austrian-Hungarian b
- AlfalfaPlant species in pea family
- Alfred Moquin-TandonChristian Horace Benedict Alfred Moquin-Tandon (7 May 1804 – 15 April 1863) was a French n
- AlgaeBaseAlgaeBase is a global species database of information on all groups of algae, both marine
- AliivibrioAliivibrio is a genus in the phylum Pseudomonadota (Bacteria).
- Aliivibrio fischeriSpecies of bacterium
- AliquandostipitaceaeFamily of fungi
- AlismaGenus of aquatic plants
- Alisma lanceolatumSpecies of plant
- AlismataceaeFamily of flowering plants comprising the water-plantains
- AlismatalesOrder of herbaceous flowering plants of marshy and aquatic habitats
- Alismatid monocotsGrade of flowering plant orders within Lilianae
- AlkannaGenus of flowering plants in the borage family
- Alkanna tinctoriaSpecies of flowering plant
- AllamandaGenus
- Allamanda schottiiSpecies of flowering plant
- Alliaria petiolataSpecies of flowering plant in the cabbage family
- Alligator pepperSpice made from the seeds of Aframomum species
- AllioideaeSubfamily of flowering plants
- AlliumGenus of flowering plants
- Allium ampeloprasumSpecies of plant
- Allium caeruleumSpecies of flowering plant
- Allium carinatumSpecies of flowering plant
- Allium chinenseSpecies of Allium
- Allium cristophiiSpecies of flowering plant
- Allium fistulosumSpecies of plant
- Allium flavumSpecies of flowering plant
- Allium hollandicumSpecies of flowering plant
- Allium macrostemonSpecies of wild onion widespread across much of East Asia
- Allium molySpecies of flowering plant
- Allium neapolitanumSpecies of plant
- Allium nigrumSpecies of flowering plant
- Allium ochotenseSpecies of plant
- Allium oschaniniiAllium oschaninii, the French gray shallot, griselle or true shallot, is a perennial plant
- Allium scorodoprasumSpecies of flowering plant
- Allium senescensSpecies of plant
- Allium sphaerocephalonSpecies of flowering plant
- Allium stipitatumSpecies of flowering plant
- Allium textileNorth American onion species
- Allium thunbergiiSpecies of plant
- Allium tricoccumSpecies of wild onion
- Allium triquetrumSpecies of flowering plant
- Allium tuberosumSpecies of onion native to Shanxi, China
- Allium ursinumSpecies of flowering plant
- Allium validumSpecies of flowering plant
- Allium victorialisSpecies of flowering plant
- Allium vinealeSpecies of flowering plant
- AllocasuarinaGenus of flowering plants
- Allocasuarina torulosaSpecies of tree
- Allomyces macrogynusAllomyces macrogynus is a species of fungus in the family Blastocladiaceae. It was first d
- AlloteropsisAlloteropsis (from the Greek allotrios ("strange") and opsis ("appearance")) is a genus of
- Alloteropsis semialataSpecies of grass
- AllspicePungent fruit of the tree Pimenta dioica
- Alniaria alnifoliaSpecies of flowering plant in the rose family
- Alnus cordataSpecies of plant
- Alnus glutinosaSpecies of flowering plant in the birch family
- Alnus incanaSpecies of tree
- Alnus nitidaSpecies of tree
- Alnus rubraSpecies of tree
- AlocasiaGenus of flowering plant
- Alocasia cucullataAlocasia cucullata is a species of flowering plant in the arum family known by the common
- Alocasia infernalisSpecies of flowering plant
- Alocasia longilobaSpecies of flowering plant
- Alocasia macrorrhizosSpecies of flowering plant
- Alocasia meloSpecies of flowering plant
- Alocasia sanderianaAlocasia sanderiana, commonly known as the kris plant or Sander's alocasia, is a plant in
- Alocasia wentiiSpecies of flowering plant
- Aloe arborescensSpecies of succulent
- Aloe brevifoliaSpecies of succulent
- Aloe maculataSpecies of succulent
- Aloe polyphyllaSpecies of succulent
- Aloe veraSpecies of plant
- AloiampelosAloiampelos (combination of 'Aloe' and 'ampelos'=vine or creeper), formerly Aloe ser. Macr
- Aloiampelos commixtaSpecies of flowering plant
- Aloiampelos striatulaSpecies of flowering plant
- AloinAloin, also known as barbaloin, is a bitter, yellow-brown colored compound noted in the ex
- AlopecurusGenus of flowering plants in the grass family
- Alopecurus aequalisSpecies of flowering plant
- Alopecurus geniculatusSpecies of grass
- Alopecurus myosuroidesSpecies of grass
- Alopecurus pratensisSpecies of flowering plant in the grass family
- Aloysia citrodoraSpecies of plant
- Aloysia deserticolaSpecies of shrub
- AlphitoniaGenus of flowering plants
- Alphitonia excelsaSpecies of tree
- Alphonso mangoMango cultivar
- Alpine gardenAn alpine garden (or alpinarium, alpinum) is a domestic or botanical garden, or more often
- Alpine plantPlants that grow at high elevation
- AlpiniaGenus of flowering plants
- Alpinia galangaSpecies of flowering plant
- Alpinia officinarumSpecies of flowering plant
- Alpinia zerumbetAlpinia zerumbet, commonly known as shell ginger among other names, is a perennial species
- Alsophila australisSpecies of fern
- Alsophila dregeiSpecies of fern
- Alsophila spinulosaSpecies of fern
- AlstoniaGenus of flowering plants
- Alstonia macrophyllaSpecies of flowering plant
- Alstonia scholarisSpecies of flowering plant
- AlstroemeriaceaeFamily of flowering plants
- Alternanthera brasilianaSpecies of plant
- Alternanthera philoxeroidesSpecies of aquatic plant
- Alternanthera sessilisSpecies of flowering plant
- AlternariaGenus of fungi
- Alternaria alternataPathogenic fungus
- Alternaria brassicaeSpecies of fungus
- Alternaria brassicicolaSpecies of fungus
- Alternaria carthamiSpecies of fungus
- Alternaria citriSpecies of fungus
- Alternaria dauciSpecies of fungus
- Alternaria dianthiFungal plant pathogen
- Alternaria helianthiSpecies of fungus
- Alternaria japonicaSpecies of fungus
- Alternaria leaf spotAlternaria leaf spot or Alternaria leaf blight are a group of fungal diseases in plants, t
- Alternaria maliSpecies of fungus
- Alternaria solaniSpecies of fungus
- Alternaria tenuissimaSpecies of fungus
- Alternaria triticinaFungal disease (leaf blight) of wheat
- Althaea (plant)Genus of flowering plants
- Althaea officinalisSpecies of plant
- AltingiaceaeFamily of flowering plants in the order Saxifragales
- Alyogyne hakeifoliaSpecies of flowering plant
- AlysicarpusAlysicarpus is a genus of flowering plants in the legume family, Fabaceae. It is distribut
- Alysicarpus rugosusSpecies of plant
- Alysicarpus vaginalisAlysicarpus vaginalis is a species of flowering plant in the legume family, Fabaceae. It i
- AlyssumGenus of flowering plants
- Alyssum alyssoidesSpecies of flowering plant in the cabbage family
- Alyssum montanumSpecies of flowering plant
- Alyssum wulfenianumSpecies of plant in the mustard family
- AlyxiaGenus of flowering plants
- Alyxia buxifoliaAlyxia buxifolia, otherwise known as the sea box or dysentery bush, is a species of evergr
- Alyxia stellataSpecies of plant
- AmadouSpongy material derived from fungi
- AmanitaGenus of mushrooms
- Amanita abruptaSpecies of fungus
- Amanita basiiAmanita basii is a mushroom of the family Amanitaceae.
- Amanita bisporigeraPoisonous species of fungus
- Amanita caesareaSpecies of fungus
- Amanita chepangianaAmanita chepangiana, commonly known as the Chepang slender Caesar, is a species of agaric
- Amanita citrinaSpecies of fungus
- Amanita cokeriSpecies of fungus
- Amanita exitialisSpecies of fungus
- Amanita flavoconiaSpecies of fungus
- Amanita frostianaSpecies of fungus
- Amanita fuligineaSpecies of fungus
- Amanita fulvaSpecies of fungus
- Amanita gemmataSpecies of mushroom-forming fungus
- Amanita jacksoniiSpecies of fungus
- Amanita magniverrucataAmanita magniverrucata, commonly known as the pine cone amanita, or great pine jewel, is a
- Amanita muscaria var. guessowiiVariety of fungi
- Amanita ocreataSpecies of poisonous fungus in the genus Amanita
- Amanita pantherinaSpecies of fungus
- Amanita parcivolvataSpecies of fungus
- Amanita persicinaSpecies of fungus
- Amanita porphyriaSpecies of fungus
- Amanita princepsSpecies of fungus
- Amanita regalisSpecies of fungus
- Amanita smithianaSpecies of fungus
- Amanita sphaerobulbosaSpecies of fungus
- Amanita subjunquilleaAmanita subjunquillea, also known as the East Asian death cap is a mushroom of the large g
- Amanita vaginataSpecies of fungus
- Amanita velosaSpecies of fungus
- Amanita vernaPoisonous mushroom
- Amanita virosaSpecies of fungus
- Amanita zambianaSpecies of fungus
- Amaranth grainEdible grain of the Amaranth genus
- AmaranthaceaeFamily of flowering plants
- Amaranthus browniiExtinct species of flowering plant
- Amaranthus caudatusSpecies of flowering plant
- Amaranthus cruentusSpecies of flowering plant
- Amaranthus graecizansSpecies of flowering plant
- Amaranthus hybridusSpecies of flowering plant
- Amaranthus hypochondriacusSpecies of flowering plant
- Amaranthus palmeriSpecies of plant
- Amaranthus retroflexusSpecies of flowering plant
- Amaranthus tricolorSpecies of flowering plant
- Amaranthus tuberculatusSpecies of flowering plant
- Amaranthus viridisSpecies of flowering plant
- AmaryllidaceaeFamily of flowering plants
- AmaryllidoideaeSubfamily of flowering plants
- Amaryllis belladonnaSpecies of flowering plant
- AmatoxinFamily of toxins
- AmblystegiaceaeFamily of mosses
- AmborellaSpecies of flowering plant
- Ambrosia artemisiifoliaSpecies of flowering plant in the daisy family
- Ambrosia tomentosaSpecies of flowering plant
- Ambrosia trifidaSpecies of flowering plant
- AmchoorDried unripe mango powder
- Amédée MasclefAmédée Masclef (9 August 1858 Béthune – 1916) was a French abbé and botanist best known fo
- AmelanchierService berry
- Amelanchier × lamarckiiSpecies of flowering plant
- Amelanchier alnifoliaSpecies of tree
- Amelanchier canadensisSpecies of tree
- Amelanchier laevisSpecies of tree
- AmentotaxusGenus of conifers
- Amentotaxus formosanaAmentotaxus formosana, the Taiwan catkin yew, is a species of conifer in the family Taxace
- Amentotaxus yunnanensisAmentotaxus yunnanensis, the Yunnan catkin yew, is a species of conifer in the yew family,
- American chestnutSpecies of chestnut tree
- American ginsengSpecies of flowering plant
- American Horticultural SocietyU.S. non-profit organization
- American Journal of BotanyPeer-reviewed scientific journal
- American Society of Plant TaxonomistsBotanical organization
- Ammi (plant)Ammi is a genus of about six species of summer-flowering plants in the carrot family Apiac
- Ammi majusSpecies of plant
- Ammonia fungiFungi that grow quickly in the presence of ammonia
- Ammophila (plant)Genus of flowering plants
- Ammophila (wasp)Ammophila is the type genus of the subfamily Ammophilinae of the hunting wasp family Sphec
- Ammophila arenariaSpecies of flowering plant in the grass family
- Amnesty binAn amnesty bin or amnesty box is a receptacle into which items can be placed without incur
- AmoebidaeThe Amoebidae are a family of Amoebozoa, including naked amoebae that produce multiple pse
- AmomumGenus of flowering plants
- AmorphaGenus of legumes
- Amorpha fruticosaSpecies of flowering plant in the pea family
- Amorphophallus konjacEdible plant from Yunnan, China
- Amorphophallus paeoniifoliusStaple root food in southeast Asia
- Amorphophallus titanumSpecies of flowering plant
- Ampelomyces quisqualisSpecies of fungus
- AmpelopsisGenus of shrubs
- AmphisphaeriaceaeFamily of fungi
- Ampulloclitocybe clavipesSpecies of fungus
- AmylocorticialesOrder of fungi
- Amyloid (mycology)Adjective describing a positive test result for starches
- AmyloplastType of plastid, double-enveloped organelles in plant cells
- AnabaenaGenus of bacteria
- AnacampserotaceaeFamily of plants
- AnacamptisAnacamptis is a genus of flowering plants in the orchid family (Orchidaceae); it is often
- Anacamptis morioSpecies of plant
- AnacardiaceaeFamily of flowering plants that includes cashew and mango
- AnacardioideaeAnacardioideae is a subfamily of plants in the family Anacardiaceae.
- Anacis verticillataSpecies of flowering plant
- Anacyclus pyrethrumSpecies of plant
- AnadenantheraGenus of plants
- Anadenanthera colubrinaSpecies of plant
- Anadenanthera peregrinaSpecies of plant
- AnagallisGenus of flowering plants
- Anamirta cocculusClimbing plant
- AnaphalisGenus of flowering plants
- Anaphalis javanicaSpecies of flowering plant
- Anaphalis margaritaceaSpecies of flowering plant
- Anaphalis triplinervisSpecies of plant
- AnastaticaGenus of flowering plants
- AnchusaGenus of flowering plants in the borage family
- Anchusa capensisSpecies of flowering plant
- Anchusa officinalisSpecies of flowering plant
- Anchusa-class sloopThe twenty-eight Anchusa-class sloops were built under the Emergency War Programme for the
- Ancient Bristlecone Pine ForestThe Ancient Bristlecone Pine Forest is a protected area high in the White Mountains in Iny
- Ancient grainsSmall, hard, dry seeds used as food
- Anders MunkAnders Munk (born 1922 in Kolding – died June 1989 in Copenhagen) was a Danish mycologist.
- Andrew Henderson (botanist)Andrew James Henderson (born September 8, 1950) is a palm-systematist and Curator of the I
- Andrew Price MorganAndrew Price Morgan (27 October 1836 – 19 October 1907) was an American botanist. He inves
- Andrew Thomas GageAndrew Thomas Gage FLS CIE (14 December 1871 – 21 January 1945) was a Scottish botanist an
- AndrographisAndrographis is a genus of flowering plants in the family Acanthaceae. They may be general
- Andrographis paniculataSpecies of flowering plant
- Andromeda polifoliaSpecies of flowering plant
- AndropogonGenus of grasses
- Andropogon gerardiSpecies of grass
- Andropogon glomeratusSpecies of plant
- Andropogon virginicusSpecies of plant
- AndrosaceGenus of flowering plants
- Androsace laevigataAndrosace laevigata, synonym Douglasia laevigata, known as the cliff dwarf primrose, is a
- Aneilema aequinoctialeAneilema aequinoctiale is a flowering shrub native to much of sub-Saharan Africa. It is so
- AnemonastrumAnemonastrum is a genus of flowering plants in the family Ranunculaceae. Plants of the gen
- AnemoneGenus of flowering plants
- Anemone coronariaSpecies of flowering plant in the buttercup family
- Anemone hepaticaSpecies of flowering plant
- AnemonoidesGenus of flowering plants in the buttercup family
- Anemonoides blandaSpecies of flowering plant in the buttercup family
- Anemonoides nemorosaSpecies of flowering plant in the buttercup family
- Anemonoides quinquefoliaAnemonoides quinquefolia (French: anémone à cinq folioles), a flowering plant in the butte
- Anemonoides ranunculoidesSpecies of flowering plant
- Anemonoides sylvestrisSpecies of flowering plant in the buttercup family
- AnemonopsisGenus of flowering plants
- AnemophilyWind pollination
- AnemopsisGenus of flowering plants
- AnethumAnethum is a flowering plant genus in the family Apiaceae, native to the Middle East and t
- Aneura (plant)Aneura is a genus of liverworts in the family Aneuraceae.
- Aneura mirabilisSpecies of liverwort
- AneuraceaeFamily of liverworts
- AngelicaGenus of flowering plants
- Angelica acutilobaSpecies of flowering plant
- Angelica archangelicaSpecies of plant
- Angelica glaucaSpecies of plant in the celery family
- Angelica sinensisSpecies of flowering plant
- Angelica sylvestrisSpecies of flowering plant
- Angelo CelliAngelo Celli (25 March 1857 – 2 November 1914) was an Italian physician, hygienist, parasi
- AngeloniaGenus of flowering plants
- Angelonia angustifoliaAngelonia angustifolia, the summer snapdragon, is a species of perennial plant in the fami
- Angiopteris evectaSpecies of fern
- Angiosperm Phylogeny GroupCollaborative research group for the classification of flowering plants
- AngophoraGenus of flowering plants
- AngraecumGenus of orchids
- Angraecum eburneumAngraecum eburneum is a species of orchid. Their common name the "comet orchid". They gene
- AnguloaSpecies of plant
- AnibaGenus of flowering plants
- Aniba rosaeodoraSpecies of tree
- AnigozanthosGenus of flowering plants
- Anigozanthos humilisSpecies of flowering plant
- Anigozanthos manglesiiSpecies of flowering plant
- Anigozanthos onycisSpecies of flowering plant
- Anigozanthos rufusAnigozanthos rufus is a grass-like evergreen perennial plant native to the southern coasts
- Aningeria adolfi-friedericiSpecies of tree
- Anisodontea capensisSpecies of flowering plant
- Anisodus tanguticusSpecies of plant
- Anisogramma anomalaSpecies of fungus
- AnisomeridiumAnisomeridium is a genus of lichens in the family Monoblastiaceae. The type species was or
- AnisophylleaAnisophyllea is a genus of plant in the family Anisophylleaceae. The generic name is from
- AnisophylleaceaeFamily of flowering plants
- Anna Murray VailAnna Murray Vail (January 7, 1863 – December 18, 1955) was an American botanist and the fi
- Annals of BotanyScientific journal devoted to plant biology
- AnnattoOrange-red condiment and food coloring derived from the seeds of the achiote tree
- AnnonaGenus of fruits and plants
- Annona crassifloraSpecies of fruit and plant
- Annona montanaSpecies of tree
- Annona mucosaSpecies of tropical fruit plant
- Annona purpureaAnnona purpurea is an edible fruit and medicinal plant in the Annonaceae family. It is nat
- Annona reticulataSpecies of tree
- Annona senegalensisSpecies of plant
- Annona squamosaSpecies of tree
- AnnonaceaeFamily of flowering plants
- AnnonacinAnnonacin is a chemical compound with toxic effects, especially in the nervous system, fou
- Annual growth cycle of grapevinesProcess that takes place in the vineyard each year
- Annual Review of Plant BiologyAcademic journal
- Annual vs. perennial plant evolutionAnnuality (living and reproducing in a single year) and perenniality (living more than two
- AnnulatascaceaeFamily of fungi
- AnnulatascusAnnulatascus is a genus of fungi in the Annulatascaceae family of the Ascomycota. The rela
- Annulus (mycology)Ring on mushroom stipe
- Anoda cristataPlant species in the mallow family
- AnoectochilusGenus of orchids
- AnselliaGenus of orchids
- Ant–fungus mutualismSymbiotic relationship
- Antagonism (phytopathology)Action of an organism that harms or interferes with the functioning of another organism
- Antarctic floraDistinct community of plants which evolved on the supercontinent of Gondwana
- Antarctic floristic kingdomGeographic area with a relatively uniform composition of plant species in the Antarctic
- AntennariaGenus of flowering plants
- AntennulariellaAntennulariella is a genus of fungi in the family Antennulariellaceae. The genus was circu
- AntennulariellaceaeFamily of fungi
- AntestiopsisAntestiopsis is a genus of shield bug in the tribe Antestiini: commonly known as antestia
- AnthecologyStudy of pollination biology
- AnthemideaeAnthemideae is a tribe of flowering plants in the subfamily Asteroideae, which is part of
- AnthericumAnthericum is a genus of about 65 species, rhizomatous perennial plants in the family Aspa
- Anthericum liliagoSpecies of flowering plant
- AnthocerosGenus of hornworts
- AnthophytaThe anthophytes are a paraphyletic grouping of plant taxa bearing flower-like reproductive
- AnthoxanthumGenus of grasses
- Anthoxanthum aristatumAnthoxanthum aristatum is a species of grass known by the common names awned vernalgrass o
- Anthoxanthum odoratumAnthoxanthum odoratum is a short-lived perennial grass, commonly known as sweet vernal gra
- AnthracoideaAnthracoidea is a genus of smut fungi belonging to the family Anthracoideaceae.
- AnthracoideaceaeFamily of fungi
- AnthriscusGenus of flowering plants
- Anthriscus sylvestrisSpecies of flowering plant
- AnthroneAnthrone is a tricyclic aromatic ketone. It is used for a common cellulose assay and in th
- Anthurium andraeanumSpecies of plant
- Anthurium clarinerviumSpecies of flowering plant
- Anthurium scherzerianumSpecies of flowering plant
- AnthyllisAnthyllis is a genus of flowering plants in the family Fabaceae. This genus contains both
- Anthyllis hermanniaeSpecies of plant in the legume family
- Antibiotic resistance in gonorrheaNeisseria gonorrhoeae, the bacterium that causes the sexually transmitted infection gonorr
- AntidesmaGenus of flowering plants
- Antidesma buniusSpecies of tree
- Antidesma platyphyllumAntidesma platyphyllum is a species of flowering tree in the leafflower family, Phyllantha
- AntifolateAntifolates are a class of antimetabolite medications that antagonise (that is, block) the
- Antigenic driftAntigenic drift is a kind of genetic variation in viruses, arising from the accumulation o
- AntirrhineaeThe Antirrhineae are one of the 12 tribes of the family Plantaginaceae. It contains the to
- AntirrhinumGenus of plants
- Antirrhinum majusSpecies of flowering plant
- Antonio BertoloniAntonio Bertoloni (February 8, 1775 in Sarzana – April 17, 1869 in Bologna) was an Italian
- Antonio CarluccioAntonio Carluccio, OBE, OMRI (Italian: ; 19 April 1937 – 8 November 2017) was an Italian c
- AntrodiaGenus of fungi
- AnubiasGenus of flowering plants
- Anubias afzeliiAnubias afzelii is a species belonging to the Aroid genus Anubias. It was first described
- Anubias gilletiiAnubias gilletii is a plant that was first described scientifically in 1901 by Émile Augus
- Anubias hastifoliaAnubias hastifolia is a species belonging to the Aroid genus Anubias. It was first mention
- Anubias heterophyllaAnubias heterophylla is a species belonging to the Aroid genus Anubias. It was first descr
- AoB PlantsAoB Plants (AoBP) is a peer-reviewed open-access, non-profit scientific journal establishe
- APG II systemSystem of plant taxonomy
- APG III systemSystem of plant taxonomy
- APG IV system2016 revision of a flowering plant classification
- APG systemSystem of plant taxonomy
- Aphananthe philippinensisSpecies of tree
- AphanoascusAphanoascus is a genus of fungi in the family Onygenaceae. It was circumscribed by Hugo Zu
- Aphanoascus fulvescensSpecies of fungus
- Aphanomyces euteichesSpecies of single-celled organism
- AphanopetalumGenus of flowering plants
- AphelandraSpecies of plant
- AphelidaPhylum of fungi
- AphloiaMonotypic genus of flowering plants
- ApialesOrder of eudicot flowering plants in the asterid group
- Apical dominancePhenomenon where the central stem grows stronger than other stems
- ApioperdonGenus of fungi
- ApiosApios is a genus of flowering plants in the family Fabaceae. It belongs to the subfamily F
- Apios americanaSpecies of flowering plant in the pea family
- ApiumGenus of flowering plants
- Apium graveolensSpecies of plant
- ApocynoideaeApocynoideae is a subfamily of the flowering plant family Apocynaceae (order Gentianales),
- ApocynumGenus of flowering plants
- Apocynum androsaemifoliumApocynum androsaemifolium, the fly-trap dogbane or spreading dogbane, is a flowering plant
- Apocynum cannabinumPlant species in the dogbane family
- ApomixisAsexual development of seed in botany
- Aponogeton crispusSpecies of aquatic plant
- Aponogeton distachyosSpecies of aquatic plant endemic to South Africa
- Aponogeton madagascariensisSpecies of aquatic plant
- ApophysomycesApophysomyces is a genus of filamentous fungi that are commonly found in soil and decaying
- Apophysomyces variabilisSpecies of fungus
- ApoplastExtracellular space, outside the cell membranes of plants
- AporosaGenus of flowering plants
- Aporosa cardiospermaAporosa cardiosperma is a species of plant in the family Phyllanthaceae. It is endemic to
- Aporosa ficifoliaAporosa ficifolia is a species of shrub in the family Phyllanthaceae. It grows 2-8m tall,
- Aporosa octandraSpecies of tree
- Aporosa planchonianaAporosa planchoniana is a species of shrub in the family Phyllanthaceae.
- Aporosa villosaAporosa villosa is a species of shrub or small tree in the family Phyllanthaceae. It is fo
- Apple ciderNon-alcoholic apple beverage
- ApplecrabFruit hybrid between apples and crabapples
- AppressoriumStructure produced by some fungi
- Apricot kernelToxic seed of the apricot
- AquificotaPhylum of bacteria
- AquifolialesThe Aquifoliales are an order of flowering plants, including the Aquifoliaceae (holly) fam
- AquilariaGenus of flowering plants
- AquilegiaGenus of flowering plants
- Aquilegia alpinaAlpine columbine species
- Aquilegia bertoloniiSpecies of flowering plant
- Aquilegia canadensisSpecies of flowering plant
- Aquilegia chrysanthaSpecies of flowering plant
- Aquilegia coeruleaNorth American species of columbine
- Aquilegia flabellataSpecies of flowering plant
- Aquilegia formosaWestern North American species of columbine
- Aquilegia vulgarisSpecies of flowering plant
- ArabidopsisGenus of flowering plants
- ArabisGenus of flowering plants in the cabbage family
- Arabis alpinaSpecies of flowering plant
- Arabis caucasicaSpecies of plant
- ArabitolArabitol, or arabinitol, is a sugar alcohol. It can be formed by the reduction of either a
- AraliaGenus of flowering plants
- Aralia cordataSpecies of plant
- Aralia elataSpecies of plant
- Aralia racemosaAralia racemosa, with common names American spikenard, small spikenard, Indian root, spice
- Aralia spinosaSpecies of tree
- AraliaceaeFamily of flowering plants
- AraucariaGenus of evergreen conifers
- Araucaria araucanaChilean and Argentine coniferous tree
- Araucaria bidwilliiSpecies of tree native to Australia
- Araucaria columnarisSpecies of conifer
- Araucaria cunninghamiiSpecies of pine tree in Australia
- Araucaria heterophyllaSpecies of conifer tree
- AraucariaceaeFamily of conifers
- Araucarioxylon arizonicumExtinct species of conifer
- Árbol del TuleMontezuma cypress in Oaxaca, Mexico; stoutest known tree trunk in the world
- Arbuscular mycorrhizaSymbiotic penetrative association between a fungus and the roots of a vascular plant
- ArbutusGenus of flowering plants in the heather family
- Arbutus menziesiiSpecies of evergreen tree
- Arbutus unedoSpecies of flowering plant in the heather family
- ArcangeliellaArcangeliella is a genus of gasteroid fungi in the family Russulaceae. Taxonomic and phylo
- ArceuthobiumGenus of mistletoes
- ArchaefructusExtinct genus of herbaceous aquatic seed plants
- ArchaeomarasmiusExtinct genus of fungi
- ArchaeophyteAn archaeophyte is a plant species which is non-native to a geographical region, but which
- ArchaeopterisExtinct genus of Devonian vascular plants
- ArchaeorhizomycetesClass of fungi
- ArchaeosporalesArchaeosporales is an order of fungi best known as arbuscular mycorrhiza to vascular land
- ArchaeplastidaClade of eukaryotes containing land plants and some algae
- Archidendron jiringaSpecies of plant
- ArchidiumGenus of mosses
- ArctagrostisArctagrostis is a genus of Arctic and Subarctic plants in the grass family, native to cold
- Arctagrostis latifoliaSpecies of grass from the high Arctic
- Arctic vegetationPlants adapted to the short, cold growing seasons of the Arctic regions
- Arctic–alpineAn Arctic–alpine taxon is one whose natural distribution includes the Arctic and more sout
- ArctiumGenus of flowering plants
- Arctium lappaSpecies of flowering plant
- Arctium minusSpecies of flowering plant
- Arctium tomentosumArctium tomentosum, commonly known as the woolly burdock or downy burdock, is a species of
- Arctomecon californicaSpecies of flowering plant
- ArctomiaceaeThe Arctomiaceae are a family of lichenized fungi in the Ascomycota, class Baeomycetales.
- ArctostaphylosGenus of flowering plants in the heath family
- Arctostaphylos uva-ursiSpecies of fruit and plant
- Arctostaphylos viscidaArctostaphylos viscida, with the common names whiteleaf manzanita and sticky manzanita, is
- ArctothecaArctotheca is a small genus of flowering plants in the family Asteraceae. They are annuals
- Arctotheca calendulaSpecies of plant
- ArctotisGenus of plants
- ArdisiaGenus of flowering plants
- Ardisia japonicaSpecies of flowering plant
- ArecaGenus of palms
- Areca catechuSpecies of palm
- Areca nutFruit of the areca palm chewed as a stimulant
- ArecalesOrder of flowering plants
- ArecolineStimulant alkaloid responsible for mouth cancers
- Arenaria (plant)Genus of flowering plants in the pink family
- Arenaria norvegicaSpecies of flowering plant
- ArengaArenga is a genus of palms, native to Southeast Asia, southern China, New Guinea, and nort
- Arenga pinnataSpecies of palm
- AreoleBumps on cacti out of which grow clusters of spines
- ArgemoneGenus of flowering plants
- Argemone mexicanaSpecies of plant
- ArgophyllaceaeArgophyllaceae is a family of shrubs or small trees belonging to the order Asterales. The
- ArgyranthemumGenus of flowering plants in the daisy family
- Argyranthemum frutescensSpecies of flowering plant
- ArgyreiaArgyreia is a genus of plants in the family Convolvulaceae.
- Argyreia nervosaSpecies of plant
- ArgyroxiphiumGenus of plants
- Argyroxiphium sandwicense subsp. macrocephalumSubspecies of flowering plant
- Aria (plant)Genus of plants
- Aria edulisSpecies of tree
- Aria torminalisGenus of trees in the rose family
- ArilSpecialized outgrowth that covers a seed
- ArillastrumGenus of flowering plants
- AriocarpusGenus of cacti
- Ariocarpus agavoidesSpecies of cactus
- Ariocarpus fissuratusAriocarpus fissuratus (formerly known as Anhalonium fissuratus) is a species of cactus fou
- Ariocarpus retususSpecies of cactus
- ArisaemaGenus of plants
- Arisaema candidissimumSpecies of flowering plant
- Arisaema triphyllumSpecies of flowering plant
- ArisarumArisarum is a genus of flowering plants in the family Araceae. It is native to the Mediter
- Arisarum proboscideumSpecies of flowering plant
- AristaloeMonotypic genus of flowering plant from southern Africa
- AristidaGenus of grasses
- Aristida purpureaAristida purpurea is a species of grass native to North America which is known by the comm
- Aristida strictaSpecies of grass
- AristideaeThe Aristideae is the sole tribe of grasses in the monotypic subfamily Aristidoideae of th
- AristolochiaGenus of flowering plants
- Aristolochia californicaSpecies of flowering plant
- Aristolochia grandifloraSpecies of vine
- Aristolochia littoralisSpecies of vine
- Aristolochia rotundaAristolochia rotunda, commonly known as smearwort or round-leaved birthwort, is a herbaceo
- AristolochiaceaeFamily of flowering plants
- Armenian cucumberVegetable
- ArmeriaGenus of flowering plants
- ArmeríaArmería is a municipality in the south-central part of the Mexican state of Colima. Ciudad
- ArmillariaGenus of fungi
- Armillaria fuscipesSpecies of fungus
- Armillaria gallicaSpecies of fungus
- Armillaria luteobubalinaSpecies of fungus in the family Physalacriaceae
- Armillaria melleaSpecies of fungus
- Armillaria ostoyaeSpecies of fungus
- Armillaria root rotFungal tree disease
- ArnicaGenus of flowering plants
- Arnica montanaSpecies of European flowering plant
- Aromatic riceType of rice
- AroniaGenus of plants (chokeberries)
- ArracaciaArracacia is a genus of flowering plant in the Apiaceae. It is native to the Americas, Mex
- Arracacia xanthorrhizaRoot vegetable originally from the Andes
- Arran whitebeamsWhitebeam species
- ArrhenatherumGenus of grasses
- Arrhenatherum elatiusArrhenatherum elatius is a species of flowering plant in the grass family Poaceae, commonl
- ArrheniaGenus of fungi
- Artemisia (plant)Genus of flowering plants
- Artemisia abrotanumSpecies of plant
- Artemisia absinthiumSpecies of plant
- Artemisia annuaHerb known as sweet wormwood
- Artemisia arborescensSpecies of flowering plant
- Artemisia biennisSpecies of flowering plant
- Artemisia capillarisSpecies of flowering plant
- Artemisia filifoliaSpecies of flowering plant
- Artemisia frigidaSpecies of flowering plant
- Artemisia herba-albaSpecies of plant
- Artemisia ludovicianaSpecies of plant
- Artemisia maritimaSpecies of flowering plant
- Artemisia princepsSpecies of plant
- Artemisia scopariaSpecies of flowering plant
- Artemisia tridentataSpecies of plant
- Artemisia vulgarisMedicinal plant known as common mugwort
- ArthonialesOrder of fungi
- ArthoniomycetesArthoniomycetes are a class of ascomycete fungi. It includes two orders: Arthoniales and L
- Arthrobotrys oligosporaSpecies of fungus
- ArthropodiumArthropodium is a genus of herbaceous perennial plants in the subfamily Lomandroideae of t
- Arthropodium cirratumSpecies of flowering plant
- ArticulaviralesArticulavirales is an order of segmented negative-strand RNA viruses which infect inverteb
- ArtocarpeaeArtocarpeae is a tribe within the plant family Moraceae. It includes 7 to 12 genera and 70
- ArtocarpusGenus of trees and shrubs
- Artocarpus integerAsian tree related to breadfruit and jackfruit
- Artocarpus odoratissimusSpecies of flowering plant
- Artomyces pyxidatusSpecies of fungus
- ArumGenus of flowering plants
- Arum creticumSpecies of plant
- Arum italicumSpecies of flowering plant
- Arum maculatumSpecies of flowering plant
- AruncusAruncus is a genus of clump-forming herbaceous perennial plants in the family Rosaceae. Bo
- Aruncus dioicusSpecies of flowering plant
- ArundinariaGenus of American bamboo, often referred to in American English as cane
- Arundinaria giganteaSpecies of bamboo from North America known as giant river cane
- ArundoGenus of grasses
- Arundo donaxSpecies of plant
- AsafoetidaIndian spice derived from Ferula roots
- AsarumGenus of flowering plants
- Asarum canadenseSpecies of flowering plant
- Asarum europaeumSpecies of flowering plant
- Asarum sieboldiiSpecies of plant
- AscarinaAscarina is an ancient, woody, angiosperm genus. It is a distinct genus of Chloranthaceae
- AsclepiadoideaeSubfamily of plants
- AsclepiasGenus of flowering plants
- Asclepias asperulaSpecies of flowering plant
- Asclepias curassavicaSpecies of flowering plant
- Asclepias incarnataSpecies of flowering plant
- Asclepias purpurascensSpecies of flowering plant
- Asclepias syriacaSpecies of flowering plant
- Asclepias tuberosaSpecies of flowering plant
- AscobolaceaeThe Ascobolaceae are a family of fungi in the order Pezizales. A 2008 estimate places 6 ge
- AscocarpFruiting body of an ascomycete fungus
- AscochytaAscochyta is a genus of ascomycete fungi, containing several species that are pathogenic t
- Ascochyta diseases of peaAscochyta blights occur throughout the world and can be of significant economic importance
- Ascochyta pisiSpecies of fungus
- Ascocoryne sarcoidesSpecies of fungus
- AscosporeSpores produced in an ascus
- Aseroe rubraSpecies of fungus
- Asgard archaeaKingdom of archaea
- AshitabaSpecies of flowering plant
- Asian cuisineCulinary traditions of Asia
- AsiminaNorth American genus of fruit trees
- Asimina trilobaSpecies of tree
- AspalathusAspalathus is a genus of flowering plants in the family Fabaceae. The yellow flowers and s
- AsparagaceaeFamily of plants
- AsparagalesOrder of monocot flowering plants
- Asparagus (genus)Genus of flowering plants
- Asparagus aethiopicusSpecies of flowering plant
- Asparagus beanLegume cultivated for its edible pods
- Asparagus cochinchinensisSpecies of flowering plant
- Asparagus densiflorusSpecies of flowering plant
- Asparagus racemosusSpecies of flowering plant
- Asparagus setaceusSpecies of plant
- AspenCommon name for certain tree species in the Populus genus
- AspergillaceaeFamily of fungi
- AspergillusGenus of fungi
- Aspergillus clavatusSpecies of fungus
- Aspergillus flavusSpecies of fungus
- Aspergillus fumigatusSpecies of fungus
- Aspergillus glaucusSpecies of fungus
- Aspergillus nidulansSpecies of fungus
- Aspergillus nigerSpecies of fungus
- Aspergillus ochraceusSpecies of fungus
- Aspergillus oryzaeFilamentous fungus
- Aspergillus parasiticusSpecies of fungus
- Aspergillus penicillioidesSpecies of fungus
- Aspergillus sojaeAspergillus sojae is a species of fungus in the genus Aspergillus.
- Aspergillus sydowiiSpecies of fungus
- Aspergillus terreusSpecies of fungus
- Aspergillus tubingensisSpecies of fungus
- Aspergillus ustusSpecies of fungus
- Aspergillus versicolorSpecies of fungus
- AsphodelaceaeFamily of flowering plants
- AsphodeloideaeSubfamily of flowering plants
- AsphodelusGenus of flowering plants
- Asphodelus aestivusAsphodelus aestivus, the summer asphodel, is a species of asphodel, a common Western Medit
- Asphodelus albusSpecies of plant
- Asphodelus ramosusSpecies of flowering plant
- AspiciliaGenus of lichen-forming fungi
- Aspicilia cinereaAspicilia cinerea (cinder lichen) is a gray to almost white, 1.5–15 cm (0.59–5.91 in) wide
- AspidistraAspidistra is a genus of flowering plants in the family Asparagaceae, subfamily Nolinoidea
- Aspidistra elatiorSpecies of flowering plant
- Aspidosperma polyneuronSpecies of flowering plant
- Aspidosperma quebracho-blancoSpecies of tree
- AspleniaceaeFamily of ferns
- AspleniineaeSuborder of ferns
- Asplenium × ebenoidesHybrid fern
- Asplenium adiantum-nigrumAsplenium adiantum-nigrum is a common species of fern known by the common name black splee
- Asplenium nidusSpecies of fern in the spleenwort family
- Asplenium scolopendriumSpecies of fern in the spleenwort family
- Asplenium trichomanesSpecies of fern in the spleenwort family
- Aspropaxillus giganteusSpecies of fungus
- AsteliaceaeFamily of flowering plants
- Aster (genus)Genus of flowering plants in the daisy family
- Aster alpinusSpecies of plant
- Aster amellusSpecies of plant
- Aster tataricusSpecies of plant
- Aster yellowsPlant disease
- AsteralesLarge order of flowering plants
- AsteridsClade of eudicot angiosperms
- Asterina (fungus)Asterina is a large genus of fungi in the Asterinaceae family. It was then placed in Aster
- AsterinaceaeFamily of fungi
- AsteroideaeSubfamily of flowering plants
- AsterophoraAsterophora is a genus of fungi that grow as parasites on mushrooms. The genus contains fo
- AsteroxylonExtinct genus of spore-bearing plants
- AstianthusAstianthus is a monotypic genus of flowering plants in the Bignoniaceae family. The sole s
- AstilbeGenus of flowering plants
- Astilbe chinensisSpecies of plant
- Astraeus (fungus)Genus of fungi
- Astraeus hygrometricusCosmopolitan species of fungus
- Astraeus sirindhorniaeAstraeus sirindhorniae is a species of false earthstar in the family Diplocystaceae. A. si
- Astragalus (plant)Genus of legumes
- Astragalus cicerSpecies of legume
- Astragalus crassicarpusSpecies of legume
- Astragalus gummiferSpecies of legume
- Astragalus mongholicusSpecies of plant
- Astragalus sarcocollaSpecies of legume
- Astragalus tragacanthaAstragalus tragacantha, commonly known as astragale de Marseille or coussin-de-belle-mère,
- AstrantiaAstrantia is a genus of herbaceous plants in the family Apiaceae, native to Central, Easte
- Astrantia bavaricaSpecies of plant
- Astrantia majorSpecies of flowering plant
- Astrantia maximaSpecies of flowering plant
- AstrocaryumGenus of palms
- Astrocaryum aculeatumSpecies of palm
- Astrocaryum murumuruSpecies of palm
- Astrocaryum standleyanumSpecies of palm
- AstrophytumAstrophytum is a genus of six species of cacti, native to North America.
- Astrophytum asteriasSpecies of cactus
- Astrophytum capricorneSpecies of cactus
- Atalaya (plant)Genus of plants
- Ataulfo (mango)Mango variety produced in Mexico
- Atelopus variusAtelopus varius, the Costa Rican variable harlequin toad or clown frog, is a small Neotrop
- AtemoyaSpecies of fruit and plant
- Athelia (fungus)Athelia is a genus of corticioid fungi in the family Atheliaceae. Some species are faculta
- AtheliaceaeFamily of fungi
- Atherton TablelandThe Atherton Tableland is a fertile plateau, which is part of the Great Dividing Range in
- AthrotaxisAthrotaxis is a genus of two to three species (depending on taxonomic opinion) of conifers
- Athrotaxis selaginoidesGrowth Patterns
- AthyriaceaeFamily of ferns
- AthyriumGenus of ferns
- Athyrium distentifoliumSpecies of plant
- Athyrium filix-feminaSpecies of fern
- Athyrium flexileSpecies of fern
- Athyrium niponicumSpecies of plant
- Atlases of the flora and fauna of Great Britain and IrelandThe biodiversity of Great Britain and Ireland is one of the most well-studied geographical
- Atomic gardeningForm of mutation breeding in plants
- AtractocarpusGenus of flowering plants
- Atractocarpus fitzalaniiAtractocarpus fitzalanii, commonly known as the brown gardenia or yellow mangosteen, is a
- AtractylodesAtractylodes is a genus of Asian flowering plants in the family Asteraceae.
- Atractylodes lanceaSpecies of plant
- AtranorinAtranorin is a chemical substance produced by some species of lichen. It is a secondary me
- AtriplexGenus of flowering plant
- Atriplex cinereaSpecies of plant
- Atriplex hortensisSpecies of flowering plant
- Atriplex lentiformisSpecies of bush
- Atriplex prostrataSpecies of flowering plant
- Atropa bella-donnaDeadly nightshade, a flowering plant
- Attalea (plant)Genus of palms
- Attalea crassispathaSpecies of palm
- Attalea dubiaSpecies of palm
- Attalea speciosaSpecies of palm
- Aucuba japonicaSpecies of plant
- August GrisebachAugust Heinrich Rudolf Grisebach (pronounced ; 17 April 1814 – 9 May 1879) was a German bo
- Auguste ChevalierAuguste Jean Baptiste Chevalier (June 1873, in Domfront – June 1956, in Paris) was a Frenc
- Auguste-Marie HueFather Auguste-Marie Hue (15 August 1840 – 22 June 1917) was a French lichenologist.
- Augustin Abel Hector LéveilléAugustin Abel Hector Léveillé (13 March 1864, in Le Mans – 25 November 1918) was a French
- AurantioideaeSubfamily of flowering plants
- Aurel DermekAurel Dermek (born 25 July 1925, died 15 April 1989) was a Slovak mycologist, writer, phot
- AureobasidiumAureobasidium is a genus of fungi belonging to the family Dothioraceae.
- Aureobasidium pullulansSpecies of fungus
- Aureobasidium subglacialePreviously classified under the species complex Aureobasidium pullulans, Aureobasidium sub
- Aureoboletus mirabilisSpecies of fungus
- AureofungusExtinct genus of fungi
- AureonariusAureonarius is a genus of fungi in the family Cortinariaceae.
- AuriculariaGenus of fungi
- Auricularia auricula-judaeSpecies of fungus
- Auricularia corneaSpecies of fungus
- Auricularia heimuerSpecies of fungus
- Auricularia mesentericaAuricularia mesenterica, commonly known as the tripe fungus, is a species of fungus in the
- AuriculariaceaeFamily of fungi
- AuricularialesOrder of fungi
- AuriniaAurinia is a genus of flowering plants of the family Brassicaceae (Cruciferae), native to
- Aurinia saxatilisSpecies of flowering plant
- Auriscalpium vulgareSpecies of inedible European fungi
- AuritellaAuritella is a genus of fungi in the family Inocybaceae. The genus contains seven species
- Australasian Virtual HerbariumThe Australasian Virtual Herbarium (AVH) is an online resource that allows access to plant
- Australian limeLime cultivar
- Australian National Botanic GardensBotanical garden in Acton, Canberra
- Australian Native Plants SocietySociety for Australian Native Plant enthusists
- Australian Plant Name IndexAustralian online plant name database
- AustrobaileyalesOrder of flowering plants
- AustroblechnumAustroblechnum is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, acco
- Austroblechnum penna-marinaSpecies of plant
- AustrocedrusSpecies of plant
- AustroderiaGenus of grasses
- Austroderia richardiiSpecies of grass
- AustroeupatoriumGenus of flowering plants
- Author citation (botany)Citing the first publishers of a botanical name
- AutomixisAutomixis is the fusion of (typically haploid) nuclei or gametes derived from the same ind
- Autonym (botany)Automatically created scientific name
- Autumn leaf colorPhenomenon that affects the leaves during autumn
- Autumnal mothThe autumnal moth (Epirrita autumnata) is a moth of the family Geometridae. The species wa
- Auxin binding proteinProtein family
- AvenaGenus of grasses oat
- Avena fatuaSpecies of grass
- Avena nudaSpecies of grass
- Averrhoa bilimbiSpecies of tree
- Averrhoa carambolaSpecies of tree
- Avicennia germinansSpecies of tree
- Awn (botany)Pointy, hair-like plant structure
- Axel Gudbrand BlyttAxel Gudbrand Blytt (19 May 1843 – 18 July 1898) was a Norwegian professor, botanist and g
- AxonopusGenus of grasses
- Aylostera pygmaeaSpecies of cactus
- AzadirachtaAzadirachta is a genus of two species of trees in the mahogany family Meliaceae. Numerous
- Azadirachta indicaSpecies of plant
- AzollaGenus of aquatic plants
- Azolla filiculoidesSpecies of plant
- Azolla pinnataSpecies of aquatic plant
- Azolla rubraAzolla rubra, known commonly as red azolla and Pacific azolla, is a species of aquatic fer
