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- R. S. R. FitterRichard Sidney Richmond Fitter (1 March 1913 – 3 September 2005) was a British naturalist
- R. W. G. DennisRichard William George Dennis, PhD (13 July 1910 – 7 June 2003), was an English mycologist
- RacemeFlowers on short stalks along the stem
- Radiotrophic fungusFungus capable of radiosynthesis
- Raffaele CiferriRaffaele Ciferri (30 May 1897, Fermo – 12 February 1964, Pavia) was an Italian botanist, a
- Rafflesia arnoldiiSpecies of flowering plant
- RambutanSoutheast Asian fruit
- Rambutan (cryptography)Rambutan is a family of encryption technologies designed by the Communications-Electronics
- RamieType of vegetable fibre
- RamulariaRamularia is a genus of ascomycete fungi. Its species, which are anamorphs of the genus My
- RanunculaceaeFamily of eudicot flowering plants
- RanunculusGenus of flowering plants in the buttercup family
- Ranunculus aquatilisRanunculus aquatilis, the common water-crowfoot or white water-crowfoot, is a plant specie
- Ranunculus bulbosusRanunculus bulbosus, commonly known as bulbous buttercup or St. Anthony's turnip, is a per
- Ranunculus eschscholtziiRanunculus eschscholtzii is a species of buttercup flower known by the common name Eschsch
- RapiniSpecies of edible plant
- RattanMaterial (vegetable source)
- RavenalaGenus of trees
- Ravenala madagascariensisRavenala madagascariensis, commonly known as the traveller's tree, traveller's palm or Eas
- RaveneaRavenea is a genus of 20 known species of palms, all native to Madagascar and the Comoros.
- Receptacle (botany)In botany, the receptacle refers to vegetative tissues near the end of reproductive stems
- Red bananaVariety of banana
- Red DeliciousApple cultivar
- Red locustThe red locust (Nomadacris septemfasciata) is a large grasshopper species found in sub-Sah
- RedcurrantSpecies of flowering plant
- Regulation of pesticides in the European UnionA pesticide, also called Plant Protection Product (PPP), which is a term used in regulator
- René MaireFrench botanist and mycologist
- René PomerleauRené Pomerleau, OC (27 April 1904 in Saint-Ferdinand, Quebec – 11 October 1993 in Quebec C
- Reseda (plant)Reseda , also known as the mignonette , is a genus of fragrant herbaceous plants native to
- ResedaceaeResedaceae is a family of mostly herbaceous dicotyledonous plants comprising 107 known spe
- ResinomycenaResinomycena is a genus of fungi in the mushroom family Mycenaceae. The genus contains at
- Respiratory syncytial virusSpecies of virus
- Reynoutria japonicaFlowering plant (Japanese knotweed)
- Rheum rhabarbarumRheum rhabarbarum is a species of flowering plant in the family Polygonaceae, native to a
- Rheum rhaponticumRheum rhaponticum, the false rhubarb, rhapontic rhubarb or rhapontic, is a plant species i
- RhinantheaeRhinantheae is a tribe with fewer than 20 genera of herbaceous plants in the family Oroban
- RhinanthusRhinanthus is a genus of annual hemiparasitic herbaceous plants in the family Orobanchacea
- Rhingia campestrisRhingia campestris is a species of hoverfly, 7–11 millimetres (0.3–0.4 in) long, with a wi
- RhizobiaNitrogen fixing soil bacteria
- RhizocarpalesThe Rhizocarpales are an order of lichen-forming fungi in the subclass Lecanoromycetidae o
- Rhizophagus clarusRhizophagus clarus (previously known as Glomus clarum) is an arbuscular mycorrhizal fungus
- Rhizophagus irregularisArbuscular mycorrhizal fungus used as a soil inoculant
- RhizopogonGenus of fungi
- RhizopogonaceaeRhizopogonaceae are a family of fungi in the order Boletales. The family, first named and
- RhizopusGenus of fungi
- RhodiolaRhodiola is a genus of perennial plants in the family Crassulaceae that resemble Sedum and
- Rhodiola roseaSpecies of flowering plant in the stonecrop family
- Rhodocactus grandifoliusRhodocactus grandifolius (rose cactus; syn. Pereskia grandifolia) is a species of cactus n
- Rhododendron-Park BremenThe Rhododendron-Park Bremen (46 hectares), also known as the Rhododendron-Park und Botani
- RhodophanaRhodophana is a genus of mushroom-forming fungi in the family Entolomataceae. It originall
- RHS Garden BridgewaterRHS Garden Bridgewater is the Royal Horticultural Society's fifth public display garden. I
- RHS Garden Hyde HallRHS Garden Hyde Hall is a public display garden run by the Royal Horticultural Society in
- RHS Garden RosemoorRHS Garden Rosemoor is a public display garden run by the Royal Horticultural Society in n
- RhubarbSpecies of herbaceous perennial plant with fleshy, sour edible stalks
- RhyniophyteExtinct group of plants
- RibesGenus of flowering plants
- Rica-ricaRica-rica (or sometimes simply called rica) is a type of Southeast Asian hot and spicy bum
- Rice vinegarRice vinegar is a vinegar made from rice wine in East Asia (China, Japan and Korea), as we
- Richard DeverellRichard George Deverell CBE (born 1965) became Director of the Royal Botanic Gardens, Kew
- Richard Evans SchultesRichard Evans Schultes (SHULL-tees; January 12, 1915 – April 10, 2001) was an American bio
- Richard Pearce (botanist)Richard Pearce (c.1835 – 17 July 1868) was a British plant collector, who introduced the t
- RicinusMonotypic genus of plant in the spurge family
- Robert KühnerRobert Kühner (15 March 1903 in Paris – 27 February 1996 in Lyon) was a French mycologist
- RobigaliaThe Robigalia was a festival in ancient Roman religion held April 25, named for the god Ro
- Rock gardenGarden landscaped with rock features
- Roger HeimFrench botanist
- RohuSpecies of fish
- Roland ThaxterRoland Thaxter (August 28, 1858 – April 22, 1932) was an American mycologist, plant pathol
- RolliniaRollinia is a genus of plants in the family Annonaceae. While it is widely recognised as a
- Romanization of ThaiThere are many systems for the romanization of the Thai language, i.e. representing the la
- RooibosSpecies of flowering plant
- Root nodulePlant part
- Root vegetablePlant roots used as a vegetable
- RootstockPlant root system
- RoquefortFrench blue cheese
- RoridulaRoridula (; from Latin roridus "dewy") is a genus of evergreen, insect-trapping shrubs, wi
- RosalesOrder of flowering plants
- RosemarySpecies of plant
- Rosette (botany)Botany term for a circular arrangement of leaves
- RosewoodSeveral tropical woods of the genus Dalbergia
- RosidsLarge clade of flowering plants
- RosoideaeSubfamily of flowering plants
- RowanCommon name of a subgenus of flowering plants in the family Rosaceae
- Royal Ann cherryThe Royal Ann or Royal Anne (also called Napoleon, Napoleon Bigarreau and Queen Anne) is a
- Royal Botanic Gardens, KewGovernment botanical research institute in the UK
- Royal Horticultural SocietyRegistered charity in the UK
- RoystoneaGenus of palms
- Roystonea oleraceaSpecies of palm
- Roystonea regiaSpecies of palm
- RozellidaClade of microscopic fungi
- Rubia tinctorumSpecies of flowering plant (rose madder)
- RubusGenus of plants in the rose family
- Ruggero TomaselliRuggero Tomaselli (Trento, 22 August 1920 – Monzuno, 30 March 1982) was an Italian botanis
- RuhlandiellaRuhlandiella is a genus of fungi within the family Pezizaceae. Ruhlandiella species are ex
- RumexThe docks and sorrels, genus Rumex, are a genus of about 200 species of annual, biennial,
- Russet BurbankPotato cultivar
- RussulaRussula is a very large genus composed of around 750 worldwide species of ectomycorrhizal
- Russula emeticaRussula emetica, commonly known as the sickener, emetic russula, or vomiting russula, is a
- RussulaceaeFamily of fungi in the order Russulales
- RussulalesOrder of fungi
- Rust (fungus)Order of fungi
- Ruta graveolensSpecies of plant
- RutaceaeFamily of flowering plants in the order Sapindales
- Ryszard OchyraRyszard Ochyra (born 1949) is a Polish bryologist. He has focused on moss systematics of t