R
R
- Radish
- Rafnia
- Raillardia
- Rain
- Rain-Gauge
- Rakes
- Rammers
- Ramondia
- Rampion
- Ramularia
- Ranunculus
- Rapateaceae
- Raphanus (Old Greek name used)
- Raphanus (To the species described on p)
- Raphia
- Raphistemma
- Raspalia
- Raspberry
- Rats
- Rauwolfia
- Ravenala
- Ravenea
- Ravenia
- Reaumuria
- Red Astrachan – Rheum
- Red Ingestrie
- Red Maggot
- Red Quarrenden
- Red Rot
- Red Spider
- Reevesia
- Regelia
- Rehmannia
- Reineckea
- Reinwardtia
- Relhania
- Remedies (Prevention is better than cure)
- Remedies (When plants are injured)
- Remusatia
- Renanthera
- Renealmia
- Reseda
- Resedaceae
- Restiaceae
- Restrepia (Named in honour of Joseph E)
- Restrepia (To the species described on p)
- Retanilla
- Retinia
- Retiniphyllum
- Retzia
- Rhamneae
- Rhamnus
- Rhaphidophora
- Rhapidophyllum
- Rhapis (From rhapis a needle alluding)
- Rhapis (To the species described on pp)
- Rhaponticum
- Rhipsalis Sarmentacea
- Rhizobiinae
- Rhizophora
- Rhizophoreae
- Rhodamnia
- Rhodites
- Rhodochiton
- Rhododendron (Including Vireya)
- Rhododendron (Old Greek name from rhodos)
- Rhodospatha
- Rhodostachys
- Rhodothamnus
- Rhodotypos
- Rhoeo
- Rhopalostylis
- Rhubarb (Rheon barbarum has been)
- Rhubarb (Rheum Rhubarb is a well-known)
- Rhus
- Rhynchanthera
- Rhynchanthus
- Rhynchites
- Rhynchoglossum
- Rhynchosia
- Rhynchostylis (From rhynchos a beak)
- Rhynchostylis (To the species described on p)
- Rhynchotechum
- Rhytidophyllum
- Rhytisma
- Rib – Rubus Americanus
- Ribes
- Richardia
- Richea
- Ricinus (From ricinus a tick)
- Ricinus (To the species described on p)
- Ricotia
- Ridges
- Rigidella
- Riocreuxia
- Ritchiea
- Rivea
- Rivina
- Roads
- Robinia
- Rochea
- Rockeries
- Rodgersia
- Rodriguezia (Named in honour of Em)
- Rodriguezia (To the species described on p)
- Roella
- Roemeria
- Roezlia
- Rohdea
- Rollers and Rolling
- Romanzoffia
- Romneya
- Romulea (Name commemorative of Romulus)
- Romulea (To the species described on pp)
- Rondeletia
- Ronnbergia (Named in honour of M Ronnberg)
- Ronnbergia (Two species are now referred)
- Rooteries
- Rosa (Old Latin name from the Greek)
- Rosa (To the species and varieties)
- Rosaceae
- Roscheria
- Roscoea
- Rose Galls
- Rosechafer
- Rosemary
- Rosmarinus
- Rotation Cropping
- Rottboellia
- Rough Red
- Roupala
- Roupellia
- Roxburghiaceae
- Roydsia
- Royena
- Roylea
- Rubia
- Rubiaceae (Genus comprising five or six)
- Rubiaceae (Large and important natural)
- Rubus
- Rudbeckia
- Rudgea
- Rudolphia
- Ruellia
- Ruizia
- Rulingia
- Rumex
- Ruscus
- Russelia
- Rust (Cystopus candidus and Mildew)
- Rust (Under this popular name Fungi)
- Rustic Work
- Ruta
- Rutaceae
- Ruyschia
- Ryania
- Ryssopterys