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- P700P700, or photosystem I primary donor, is a molecular dimer of chlorophyll a associated wit
- PachycaulPachycauls are plants with a disproportionately thick trunk, for their height, and relativ
- PachyphlodesPachyphlodes, formerly Pachyphloeus, is a genus of Ascomycete fungi (Pezizales, Pezizaceae
- PachysandraPachysandra is a genus of five species of evergreen perennials or subshrubs, belonging to
- Padma (Vishnu)Lotus attribute of Vishnu
- PaecilomycesPaecilomyces is a genus of fungi. A number of species in this genus are plant pathogens.
- Paleotropical kingdomOne of the Earth's six floristic kingdoms
- Palhinhaea cernuaPalhinhaea cernua, synonym Lycopodiella cernua and Lycopodium cernuum, is a plant in the f
- PalynologyStudy of pollen and other acid-resistant microoscopic organic material
- PanaeolusPanaeolus is a genus of small, black-spored, saprotrophic agarics. The word Panaeolus is G
- Panaeolus semiovatus var. semiovatusPanaeolus semiovatus var. semiovatus, also known as Panaeolus semiovatus and Anellaria sep
- Panama diseasePlant disease of bananas
- Pancrace BessaPancrace Bessa (1 January 1772 – 11 June 1846) was a French natural history artist, best k
- PandaceaeThe family Pandaceae consists of three genera that were formerly recognized in the Euphorb
- PandanaceaeFamily of flowering plants
- Pando (tree)Largest known organism
- PanicoideaeSubfamily of plants
- PansyLarge, hybrid garden flower
- PanusPanus is a genus of fungi in the family Polyporaceae.
- PapaverPapaver is a genus of 70–100 species of frost-tolerant annuals, biennials, and perennials
- Papaver somniferumSpecies of flowering plant in the poppy family
- PapaveroideaePapaveroideae is a subfamily of the family Papaveraceae (the poppy family).
- Papeda (citrus)Citrus fruit and plant
- Papilionaceous flowerButterfly-like flowers
- Paprides nitidusSigaus nitidus is a species of alpine short-horned grasshopper in the family Acrididae. It
- PaprikaSpice made from red peppers
- ParakaryonUnique single-celled organism of uncertain taxonomy
- Parasitic plantType of plant
- Parietaria officinalisParietaria officinalis, the eastern pellitory-of-the-wall, also known as upright pellitory
- ParkiaParkia is a genus of flowering plants in the family Fabaceae. It belongs to the mimosoid c
- ParmeliaceaeFamily of lichens
- ParmotremaParmotrema is a genus of lichen belonging to the family Parmeliaceae. It is a large genus,
- Parmotrema perlatumSpecies of lichen
- ParthenocarpyIn botany and horticulture, parthenocarpy is the natural or artificially induced productio
- Partial veilIn mycology, a partial veil (also called an inner veil, to differentiate it from the "oute
- PassifloraGenus of flowering plants in the passion flower family
- Passiflora edulisSpecies of flowering plant in the passion flower family
- PassifloraceaeFamily of flowering plants
- Pathogenic fungusType of Fungi that causes diseases
- PatulinPatulin is an organic compound classified as a polyketide. It is named after the fungus fr
- PaubrasiliaSpecies of plant in the legume family
- Paul Christoph HenningsGerman mycologist and herbarium curator
- Paul SilvaPaul Claude Silva (October 31, 1922 – June 12, 2014) was a phycologist, marine biologist,
- Paula WolfertPaula Wolfert (born 1938) is an American author of nine books on cooking and the winner of
- PaulliniaPaullinia is a genus of flowering shrubs, small trees and lianas in the soapberry family,
- PaulowniaceaePaulowniaceae are a family of flowering plants within the Lamiales. They are a monophyleti
- PaxillaceaeThe Paxillaceae are a family of mushroom-forming fungi bearing close affinity to the bolet
- Pearl onionThe pearl onion (Allium ampeloprasum var. sectivum or A. ampeloprasum 'Pearl-Onion Group')
- PedaliaceaePedaliaceae, the pedalium family or sesame family, is a flowering plant family classified
- Pedicel (botany)In botany, a pedicel is a stem that attaches a single flower to the inflorescence. Such in
- PedicularisPedicularis is a genus of perennial green root parasite plants currently placed in the fam
- Peltigera caninaPeltigera canina, commonly known as the dog lichen, is a widely distributed species of fol
- PeltigeralesOrder of lichen-forming fungi
- PenaeaceaeThe Penaeaceae are a family of evergreen, leathery-leaved shrubs and small trees, native t
- PenicilliumGenus of fungi
- Penicillium digitatumPenicillium digitatum () is a mesophilic fungus found in the soil of citrus-producing area
- Penicillium rubensSpecies of fungus
- PeonidinPeonidin is an O-methylated anthocyanidin derived from Cyanidin, and a primary plant pigme
- PeonyGenus of flowering plants
- PeppermintHybrid species of flowering plant
- PerennialPlant that lives for more than two years
- PerianthNon-reproductive part of a flower
- PerityleaePerityleae is a tribe of flowering plants in the subfamily Asteroideae. The species of its
- Perotis (plant)Perotis is a genus of Asian, African, and Australian plants in the grass family.
- PeroxidasePeroxidases or peroxide reductases (EC number 1.11.1.x) are a large group of enzymes which
- Persicaria maculosaPersicaria maculosa (syn. Polygonum persicaria) is an annual plant in the buckwheat family
- PersimmonEdible fruit
- PertusariaPertusaria is a large genus of warty crustose lichens in the Pertusariaceae family. The fr
- PertusariaceaeThe Pertusariaceae are a family of lichen-forming fungi in the order Pertusariales.
- PertusarialesOrder of fungi
- Petenes mangrovesThe Petenes mangroves ecoregion (WWF ID: NT1428) covers mangrove habitat along the Gulf of
- Petiole (botany)Stalk attaching a leaf to a plant
- PeyoteSpecies of psychoactive cactus
- PezizaceaeFamily of fungi
- PezizalesOrder of fungi
- PezizomycotinaSubdivision of fungi
- PhaeoacremoniumPhaeoacremonium is a fungus genus associated with wilt and decline diseases of woody hosts
- PhaeocaliciumPhaeocalicium is a genus of fungi in the family Mycocaliciaceae. The genus was circumscrib
- Phaeocalicium polyporaeumPhaeocalicium polyporaeum, the fairy pin or common pin, is a species of non-lichenized fun
- PhaeodothisPhaeodothis is a genus of fungi in the family Didymosphaeriaceae.
- PhaeohyphomycosisPhaeohyphomycosis is a diverse group of fungal infections, caused by dematiaceous fungi wh
- Phaeosphaeria nodorumPhaeosphaeria nodorum (syn. Stagonospora nodorum, synonym and correct taxonomic name: Para
- PhaeosphaeriaceaeThe Phaeosphaeriaceae are a family of fungi in the order Pleosporales. Species in the fami
- Phaeotremella frondosaPhaeotremella frondosa (synonym Tremella frondosa) is a species of fungus in the family Ph
- PhakopsoraceaeThe Phakopsoraceae are a family of rust fungi in the order Pucciniales. The family contain
- PhalaenopsisGenus of orchids
- Phalaenopsis amabilisSpecies of orchid
- PhallaceaeFamily of fungi
- PhallotoxinThe phallotoxins consist of at least seven compounds, all of which are bicyclic heptapepti
- Phallus (fungus)The genus Phallus, commonly known as stinkhorns, is a group of basidiomycetes which produc
- PhaneraPhanera is a genus of flowering plants in the legume subfamily Cercidoideae and the tribe
- PhanerochaetaceaeThe Phanerochaetaceae are a family of mostly crust fungi in the order Polyporales.
- PharmacopoeiaStandard reference work on pharmaceutial drugs and compound medicines
- Phellinus ellipsoideusPhellinus ellipsoideus (formerly Fomitiporia ellipsoidea) is a species of polypore fungus
- Philipp Maximilian OpizPhilipp (Filip) Maximilian Opiz (5 June 1787 in Čáslav – 20 May 1858 in Prague) was a Czec
- Philippe-Isidore Picot de LapeyrousePhilippe-Isidore Picot de Lapeyrouse or La Peirouse, Baron de Lapeyrouse (20 October 1744
- PhilydraceaePhilydraceae is a family of flowering plants composed of three genera and a total of six k
- PhlegmaciumPhlegmacium is a genus of fungi in the family Cortinariaceae.
- Phoenix (plant)Phoenix is a genus of 14 species of palms, native to an area starting from the Canary Isla
- PholiotaPholiota is a genus of small to medium-sized, fleshy mushrooms in the family Strophariacea
- PholiotinaPholiotina is a genus of small agaric fungi. It was circumscribed by Swiss mycologist Vict
- Phoma tracheiphilaPhoma tracheiphila is a fungal plant pathogen. It causes a disease known as Mal secco on c
- Phoradendron leucarpumPhoradendron leucarpum is a species of mistletoe in the Viscaceae family which is native t
- PhotoperiodismResponses of organisms to the relative lengths of light and dark periods
- Photosystem ISecond protein complex in photosynthetic light reactions
- Photosystem IIFirst protein complex in light-dependent reactions of oxygenic photosynthesis
- PhototrophOrganism using energy from light in metabolic processes
- PhototropismGrowth of a plant in response to a light stimulus
- Phragmites australisSpecies of grass commonly known as reed
- Phryma leptostachyaPhryma leptostachya, or lopseed, is a perennial herb of the genus Phryma. When distinguish
- PhycobilinPhycobilins (from Greek: φύκος (phykos) meaning "alga", and from Latin: bilis meaning "bil
- PhycobiliproteinPhycobiliproteins are water-soluble proteins present in cyanobacteria and certain algae (r
- PhycobilisomePhycobilisomes are light-harvesting antennae that transmit the energy of harvested photons
- PhycomycetesPhycomycetes is an obsolete polyphyletic taxon for certain fungi with aseptate hyphae. It
- PhycosphereThe phycosphere is a microscale mucus region that is rich in organic matter surrounding a
- PhyllodyPhyllody is the abnormal development of floral parts into leafy structures. It is generall
- PhyllostictaPhyllosticta is a genus of fungi. Many of the species in this genus are common and importa
- PhyllotaxisArrangement of leaves on the stem of a plant
- PhysalacriaceaeThe Physalacriaceae are a family of fungi in the order Agaricales. Species in the family h
- PhytelephasGenus of palms
- Phytelephas aequatorialisThe palm tree Phytelephas aequatorialis, commonly known as Ecuadorian ivory palm, is the m
- Phytelephas seemanniiPhytelephas seemannii, commonly called Panama ivory palm, is a species of flowering plant
- PhytochemicalChemical compounds produced by plants
- PhytochemistryStudy of phytochemicals, which are chemicals derived from plants
- PhytochromeProtein used by plants, bacteria and fungi to detect light
- PhytogeographyStudy of geographic distribution of plant species
- PhytolaccaGenus of plants
- PhytolithRigid structures found in some plants
- PhytomelaninPhytomelanin (phytomelan) is a black, inert, organic material that forms a crust-like cove
- Phytophthora infestansSpecies of single-celled organism
- Picea abiesSpecies of plant
- Picea engelmanniiSpecies of North American spruce tree
- Picea glaucaSpecies of conifer
- Picea marianaNorth American species of spruce tree
- Picea rubensSpecies of plant
- Picea sitchensisSitka spruce; species of coniferous tree
- Pickled cucumberSmall pickled and fermented cucumber
- Pier Antonio MicheliPier Antonio Micheli (11 December 1679 – 1 January 1737) was a noted Italian botanist, pro
- PigacheThe pigache, also known by other names, was a kind of shoe with a sharp upturned point at
- Pigeon peaSpecies of perennial legume
- PileaPilea, with 600–715 species, is the largest genus of flowering plants in the nettle family
- Pilobolus crystallinusPilobolus crystallinus, commonly known as the "dung cannon" or "hat thrower", is a species
- Pimenta racemosaPimenta racemosa is a species of plant in the myrtle family (Myrtaceae) that is native to
- PinaceaeFamily of conifers
- PinalesOrder of conifers
- Pine nutEdible seeds of certain species of pines
- PingueculaA pinguecula is a common type of conjunctival stromal degeneration in the eye. It appears
- PinguiculaGenus of flowering plants
- Pinguicula moranensisPinguicula moranensis is a perennial rosette-forming insectivorous herb in the flowering p
- Pink ivoryPink ivory (Phyllogeiton zeyheri), also called red ivory, purple ivory, umnini or umgoloti
- Pinto beanVariety of the common bean (Phaseolus vulgaris)
- Pinus cembraPinus cembra, also known as Swiss pine, Swiss stone pine, Arolla pine, Austrian stone pine
- Pinus elliottiiSpecies of conifer tree
- Pinus halepensisSpecies of conifer
- Pinus lambertianaPine tree found in western North America
- Pinus longaevaSpecies of pine tree found in the western U.S.
- Pinus muricataPinus muricata, the bishop pine, is a pine with a very restricted range: mostly in Califor
- Pinus patulaPinus patula, commonly known as patula pine, spreading-leaved pine, or Mexican weeping pin
- Pinus pinasterSpecies of plant
- Pinus pineaSpecies of pine tree
- Pinus ponderosaSpecies of pine tree in western North America
- Pinus strobusSpecies of pine tree
- Pinus sylvestrisSpecies of conifer
- Pinus taedaSpecies of conifer
- Piper (plant)Genus of plants
- Piper aduncumPiper aduncum, the spiked pepper, matico, hierba del soldado, achotlín, cordoncillo, higui
- Piper retrofractumPiper retrofractum, the Balinese long pepper or Javanese long pepper, is a flowering vine
- PiperaceaeFamily of flowering plants in the order Piperales
- PiperalesOrder of flowering plants
- Piri piriCultivar of Capsicum frutescens
- PistachioMember of the cashew family
- PistaciaPistacia is a genus of flowering plants in the cashew family, Anacardiaceae. It contains 1
- PittosporaceaePittosporaceae is a family of flowering plants that consists of 200–240 species of trees,
- PlaneraPlanera is a genus of flowering plants with a single living species, Planera aquatica, the
- Plant cuticleWaterproof covering of aerial plant organs
- Plant defense against herbivoryEvolutionary mechanism
- Plant diseaseDiseases of plants
- Plant geneticsStudy of genes and heredity in plants
- Plant holobiontSince the colonization of land by ancestral plant lineages 450 million years ago, plants a
- Plant taxonomyScientific study of identifying, classifying, describing, and naming plants
- Plant virusVirus that affects plants
- Plantago majorSpecies of flowering plant in the plantain family
- Plants of the World OnlineOnline taxonomic plant database
- PlasmodiumGenus of parasitic protists that can cause malaria
- PlasmolysisProcess by which cells lose water in a hypertonic solution
- PlatygloealesThe Platygloeales are an order of fungi in the class Pucciniomycetes. Species in the order
- Pleomele (genus)Pleomele is a former genus of flowering plants. All its species are now placed in the genu
- PleosporaceaePleosporaceae is a family of sac fungi. They are pathogenic to humans or saprobic on woody
- PleurotaceaeThe Pleurotaceae are a family of small to medium-sized mushrooms which have white spores.
- PleurotusGenus of fungi
- Plexaurella nutansPlexaurella nutans, the giant slit-pore sea rod, is a tall species of soft coral in the fa
- PluriformeaPluriformea is a proposed sibling clade of the Filozoa, and consists of Syssomonas multifo
- PluteaceaeThe Pluteaceae are a family of small to medium-sized mushrooms which have free gill attach
- PluteusPluteus is a large genus of fungi with over 300 species. They are wood rotting saprobes wi
- Poa bulbosaPoa bulbosa is a species of grass known by the common names bulbous bluegrass or bulbous m
- PoalesOrder of monocotyledonous flowering plants
- PodaxisPodaxis is a genus of secotioid fungi in the family Agaricaceae. Species, which have the a
- PodiataClade of eukaryotes
- PodocarpaceaePodocarp family of conifers
- PogaPoga is a genus of flowering plants in the family Anisophylleaceae. It has only one curren
- Poison ivyAllergenic plant of Asia and North America
- PolemoniaceaeThe Polemoniaceae (Jacob's-ladder or phlox family) are a family of flowering plants consis
- PolemoniumPolemonium, commonly called Jacob's ladders or Jacob's-ladders (the name derived from the
- Pollination syndromeFlower traits that attract pollinators
- PollinatorAnimal that moves pollen from the male anther of a flower to the female stigma
- PolygonaceaeKnotweed family of flowering plants
- PolygonatumPolygonatum , also known as King Solomon's-seal or Solomon's seal, is a genus of flowering
- PolygonoideaePolygonoideae is a subfamily of plants in the family Polygonaceae. It includes a number of
- PolylepisFamily of shrubs and trees
- PolypodialesOrder of ferns
- PolyporaceaeFamily of fungi
- PolyporalesOrder of fungi
- PolyporeGroup of fungi
- PolyporusPolyporus is a genus of poroid fungi in the family Polyporaceae.
- PolysporangiophyteEmbryophyte plants with branched spore-bearing generation
- Polyunsaturated fatType of fatty acid defined by molecular bonds
- PomeFruit with apple-like features
- PomeloCitrus fruit from Southeast Asia
- PooideaeSubfamily of plants
- Popcorn seasoningPopcorn seasoning is any ingredient used to add flavor to popcorn. In the United States, p
- PoppyFlowering plant
- PopulusGenus of plants
- Populus tremulaSpecies of plant
- Populus tremuloidesSpecies of tree native North America
- Populus trichocarpaSpecies of tree
- PorphyraGenus of seaweed
- Portulaca oleraceaSpecies of plant in the purslane family
- PotamogetonaceaeThe Potamogetonaceae, commonly referred to as the pondweed family, is an aquatic family of
- Poultry microbiomeThe poultry microbiome is an understudied, yet extremely impactful part of the poultry ind
- Pouteria campechianaSpecies of plant
- Pouteria sapotaSpecies of tree
- Powdery mildewPowdery mildew is a fungal disease that affects a wide range of plants. Powdery mildew dis
- PrimulaGenus of flowering plants
- Primula auriculaPrimula auricula, often known as auricula, mountain cowslip or bear's ear (from the shape
- Primula elatiorPrimula elatior, the oxlip (or true oxlip), is a species of flowering plant in the family
- ProgymnospermExtinct class of vascular plants
- Prospero AlpiniVenetian physician and botanist
- Prostrate shrubA prostrate shrub is a woody plant, most of the branches of which lie upon or just above t
- ProtomycenaProtomycena is an extinct monotypic genus of gilled fungus in the family Mycenaceae, of or
- Proton pumpTransport protein
- Prumnopitys andinaPrumnopitys andina, the lleuque or Chilean plum yew, is an evergreen coniferous tree nativ
- PrunusGenus of trees and shrubs
- Prunus armeniacaSpecies of apricot
- Prunus aviumSpecies of flowering plant in the rose family
- Prunus mumeEast Asian tree species
- Prunus serotinaSpecies of tree
- PsathyrellaceaeFamily of fungi
- Pseudalbizzia inundataPseudalbizzia inundata is a perennial tree native to South America. Common names include m
- PseudanthiumType of inflorescence, clusters of flowers
- PseudeverniaPseudevernia is a genus of foliose lichens in the family Parmeliaceae. The type species of
- Pseudevernia furfuraceaSpecies of lichen-forming fungus
- Pseudogymnoascus destructansSpecies of fungus
- PseudohydnumPseudohydnum is a genus of fungi in the order Auriculariales. Basidiocarps (fruit bodies)
- PseudolarixPseudolarix is a genus of coniferous trees in the pine family Pinaceae containing three sp
- PseudomonadotaPhylum of Gram-negative bacteria
- Pseudomonas aeruginosaSpecies of bacterium
- PseudotsugaPseudotsuga is a genus of evergreen coniferous trees in the family Pinaceae (subfamily Lar
- PseudoxenasmaPseudoxenasma is a fungal genus in the family Russulaceae, described in 1976. The genus is
- PsilocybeGenus of fungi
- Psilocybe subaeruginosaSpecies of agaric fungus
- Psilocybin mushroomMushrooms containing psychoactive indole alkaloids
- PsilophytonPsilophyton is a genus of extinct vascular plants. Described in 1859, it was one of the fi
- PsoraceaeThe Psoraceae are a family of lichenized fungi in the order Lecanorales. The Austrian Bota
- Psychoactive plantPlants that induce psychotropic effects upon ingestion
- PsylliumPlant used as a dietary fiber
- PteridaceaePteridaceae is a family of ferns in the order Polypodiales, including some 1150 known spec
- PteridiniumPteridinium is an erniettomorph found in a number of Precambrian deposits worldwide. It is
- Pteridophyte Phylogeny GroupPlant classification organization
- PteridospermSeveral distinct polyphyletic groups of extinct seed-bearing plants
- Pterocarpus indicusSpecies of legume
- PucciniaceaeThe Pucciniaceae are a family of rust fungi that cause plant diseases, mainly on cereals s
- PucciniomycetesClass of fungi
- PucciniomycotinaSubdivision of fungi
- PucciniosiraceaeThe Pucciniosiraceae are a family of rust fungi in the order Pucciniales. The family conta
- PuffballForm type of fungus
- PunjabiaPunjabia is a genus of fungi in the family Psathyrellaceae. The genus is monotypic and con
- Purandar talukaPurandar taluka is a taluka of Pune district of state of Maharashtra in India. There are 1
- PurpureocilliumPurpureocillium is a fungal genus in the Ophiocordycipitaceae family. The genus now contai
- PurshiaPurshia (bitterbrush or cliff-rose) is a small genus of 5–8 species of flowering plants in
- PutteaPuttea is a genus of lichen-forming fungi with uncertain familial placement in the order L
- PVC superphylumThe PVC superphylum is a superphylum of bacteria named after its three important members,
- PyraloideaThe Pyraloidea (pyraloid moths or snout moths) are a moth superfamily containing about 16,
- PyrenaPit or stone within some fruits
- PyrenulaceaeThe Pyrenulaceae are a family of mostly lichenized fungi in the order Pyrenulales. The fam
- PyrenulalesOrder of fungi
- Pyrola asarifoliaPyrola asarifolia, commonly known as liverleaf wintergreen, bog wintergreen or pink winter
- Pyrrolidonyl-β-naphthylamidePyrrolidonyl-β-naphthylamide (PYR) is a molecule used in microbiology to detect the presen
- Pyrus × bretschneideriSpecies of tree
- Pyrus communisSpecies of pear tree
- Pyrus pyrifoliaSpecies of pear with round crisp grainy fruit
