• (1) Rabdochloa cruciata - Racosperma boormanii
• (2) Racosperma botrydion - Radula evelynae
• (3) Radula fendleri - Randia kerstingii
• (4) Randia killipii - Ranunculus bulbosus ascendens
• (5) Ranunculus bulbosus broteri - Ranunculus gracilis
• (6) Ranunculus graecus - Ranunculus paucistamineus
• (7) Ranunculus paui - Ranunculus velutinus
• (8) Ranunculus venetus - Raphanus sativus 'Candela Di Fuocco'
• (9) Raphanus sativus 'Caudatus' - Raputia ulei
• (10) Raputiarana subsigmoidea - Reaumuria hirtella
• (11) Reaumuria hypericoides - Rebutia xanthocarpa var. splendens
• (12) Rebutia xanthocarpa var. violaciflora - Remijia peruviana
• (13) Remijia physophora - Resinocaulon perfoliatum
• (14) Resnova humifusa - Retinispora dubia
• (15) Retinispora ellwangeriana - Rhamnus alaternus L. 'Argenteovariegatus'
• (16) Rhamnus alaternus L. 'Integrifolius' - Rhamnus rupestris
• (17) Rhamnus salicifolius - Rhaphidostichum boschii
• (18) Rhaphidostichum brevisetum - Rheum speciforme
• (19) Rheum spiciforme - Rhinanthus glacialis subsp. aristatus
• (20) Rhinanthus glacialis subsp. gracilis - Rhipsalis pendula
• (21) Rhipsalis penduliflora - Rhodiola petiolata
• (22) Rhodiola phariensis - Rhododendron 'Album Delicatissimmum Foliis Variegatis'
• (23) Rhododendron 'Album Delicatissimmum' - Rhododendron 'Asazakura'
• (24) Rhododendron 'Ascendens' - Rhododendron 'Berryrose'
• (25) Rhododendron 'Bert's Own' - Rhododendron 'Canaris'
• (26) Rhododendron 'Canary Isles' - Rhododendron 'Cille Shaw'
• (27) Rhododendron 'Cilpinense' - Rhododendron 'Dairymaid'
• (28) Rhododendron 'Daiseiko' - Rhododendron 'Dride'
• (29) Rhododendron 'Drift' - Rhododendron 'Exuberens'
• (30) Rhododendron 'Eye Catching' - Rhododendron 'Fulgidum Flore Pleno'
• (31) Rhododendron 'Fulgidum' - Rhododendron 'Goldfee'
• (32) Rhododendron 'Goldfinch' - Rhododendron 'Hatsu-kirishima'
• (33) Rhododendron 'Hatsu-no-hana' - Rhododendron 'Ilam Galaxy Aquarius'
• (34) Rhododendron 'Ilam Galaxy Capricorn' - Rhododendron 'Joseph Mardner'
• (35) Rhododendron 'Joseph Napoleon Baumann' - Rhododendron 'Komachimusume'
• (36) Rhododendron 'Komachiwarai' - Rhododendron 'Linwood Pink #1'
• (37) Rhododendron 'Linwood Pink #2' - Rhododendron 'Martine Maenhout'
• (38) Rhododendron 'Martine' - Rhododendron 'Mount Rainier'
• (39) Rhododendron 'Mount Ranier' - Rhododendron 'Oh My'
• (40) Rhododendron 'Oh! Kitty' - Rhododendron 'Pink Pearl Fonce'
• (41) Rhododendron 'Pink Pearl' - Rhododendron 'Red Rum'
• (42) Rhododendron 'Red Salute' - Rhododendron 'Santa Maria'
• (43) Rhododendron 'Santee' - Rhododendron 'Snow Queen'
• (44) Rhododendron 'Snow Storm' - Rhododendron 'Tanya'
• (45) Rhododendron 'Tapestry' - Rhododendron 'Vineland Flare'
• (46) Rhododendron 'Vineland Fragrance' - Rhododendron 'Zephyr'
• (47) Rhododendron 'Zero' - Rhododendron campylocarpum × discolor
• (48) Rhododendron campylogynum - Rhododendron eritimum
• (49) Rhododendron erosipetalum - Rhododendron kaempferi 'Mikawana'
• (50) Rhododendron kaempferi 'Semperflorens' - Rhododendron nakaharae 'Benenden'
• (51) Rhododendron nakaharae 'Mariko' - Rhododendron roxieanum var. cucullatum
• (52) Rhododendron roxieanum var. cucullatum dwarf Dawyck - Rhododendron viscosum 'Pink Mist'
• (53) Rhododendron viscosum 'Roseum' - Rhodomela gracilis
• (54) Rhodomela hookeriana - Rhoeo pedunculata
• (55) Rhoeo spathacea - Rhus livida
• (56) Rhus lobata - Rhynchopera paniculata
• (57) Rhynchopera pedunculata - Rhynchospora adulta
• (58) Rhynchospora affinis - Rhynchospora stricta var. demerarensis
• (59) Rhynchospora subdicephala - Rhytidophyllum leucomallon Hanst. var. flavicans Urb. & Ekman
• (60) Rhytidophyllum leucomallum - Ribes nigrum 'Hatton Giant'
• (61) Ribes nigrum 'Hilltop Baldwin' - Ribes uva-crispa 'Ostrich'
• (62) Ribes uva-crispa 'Pax' - Ricinus communis 'Niger'
• (63) Ricinus communis 'Raven' - Rinorea pruinosa
• (64) Rinorea pubescens - Robinia pseudoacacia 'Rotterdam'
• (65) Robinia pseudoacacia 'Rozynskiana' - Roegneria elytrigioides
• (66) Roegneria fibrosa - Romulea bulbocodium var. leichtliniana
• (67) Romulea bulbocodium white - Ronnbergia deleonii
• (68) Ronnbergia explodens - Rosa 'Andglo'
• (69) Rosa 'Andie Macdowell' - Rosa 'Beadix'
• (70) Rosa 'Beahor' - Rosa 'Caravelle'
• (71) Rosa 'Cardiff Bay' - Rosa 'Cocquimmer'
• (72) Rosa 'Cocquiriam' - Rosa 'Doctor Abrahams'
• (73) Rosa 'Doctor Edward Deacon' - Rosa 'Flower Carpet Amber'
• (74) Rosa 'Flower Carpet Appleblossom' - Rosa 'Good As Gold'
• (75) Rosa 'Good Life' - Rosa 'Himalayan Musk'
• (76) Rosa 'Himmelsauge' - Rosa 'Judy Shaw'
• (77) Rosa 'Jules Margottin' - Rosa 'Lady Barnby'
• (78) Rosa 'Lady Belper' - Rosa 'Madame Eliza de Vilmorin'
• (79) Rosa 'Madame Ernest Calvat' - Rosa 'Meiparnin'
• (80) Rosa 'Meiparos' - Rosa 'Nirpbiwhipy'
• (81) Rosa 'Nirpbredy' - Rosa 'Pimlico'
• (82) Rosa 'Pinata' - Rosa 'Power Point'
• (83) Rosa 'Prairie Breeze' - Rosa 'Royal Wedding'
• (84) Rosa 'Royal William' - Rosa 'Sheer Bliss'
• (85) Rosa 'Sheer Elegance' - Rosa 'Taischa'
• (86) Rosa 'Talchelsea' - Rosa 'Veteran's Honor'
• (87) Rosa 'Vi's Violet' - Rosa aganodonta
• (88) Rosa Agatha Christie = 'Kormeita' - Rosa Ascot Bonnet = 'Helbonnet'
• (89) Rosa aspera - Rosa Buxom Beauty = 'Korbilant'
• (90) Rosa buziae - Rosa canina var. subcanina
• (91) Rosa canina var. subcristata - Rosa Commonwealth Glory = 'Harclue'
• (92) Rosa communis - Rosa dumetorum f. capitata
• (93) Rosa dumetorum f. coazii - Rosa Fiona = 'Meibeluxen'
• (94) Rosa Fiona Parade = 'Poulfio' - Rosa germinata
• (95) Rosa Ghita = 'Poulren013' - Rosa hirtifolia var. gracilenta
• (96) Rosa hirtifolia var. hontiensis - Rosa laciniosula
• (97) Rosa lactea - Rosa maximiliani
• (98) Rosa maximilianum - Rosa mollis forma villifera
• (99) Rosa mollis forma vingensis - Rosa odorata var. pseudindica
• (100) Rosa odoratissima - Rosa pimpinellifolia var. attenuata
• (101) Rosa pimpinellifolia var. australis - Rosa rapinii
• (102) Rosa ratomsciana - Rosa rugosa Thunb. var. kamtchatica (Vent.) Regel
• (103) Rosa rugosa var. alba - Rosa silenidiflora
• (104) Rosa Silken Laumann = 'Lavcom' - Rosa Super Sparkle = 'Helfels'
• (105) Rosa Super Star = 'Tanorstar' - Rosa transsilvanica var. biharensis
• (106) Rosa transturkestanica - Rosa x 'Tanoronez'
• (107) Rosa x 'Twoaebi' - Rosmarinus rigidus
• (108) Rosmarinus tenuifolius - Rotula striguloides
• (109) Roubieva anthelmintica - rracenia x ahlesii x
• (110) rracenia x areolata x - Rubus amicalis x nigricans
• (111) Rubus amicalis x nigrobaccus - Rubus betckei
• (112) Rubus betonicifolius - Rubus chaerophyllus
• (113) Rubus chaerophyllus beskidarum - Rubus dalmatinus
• (114) Rubus daltrii - Rubus eurybotrys
• (115) Rubus eurypetalus - Rubus glandicaulis var. neoscoticus
• (116) Rubus glandisepalus - Rubus hirtus var. crassus
• (117) Rubus hirtus var. erythradenes - Rubus informis
• (118) Rubus infracanus - Rubus leucandrus leucandrus
• (119) Rubus leucandrus subsp. belgicus - Rubus milliformis lidforssii
• (120) Rubus millspaughi - Rubus obrosus var. puberulicaulis
• (121) Rubus obrosus var. ribiformis - Rubus peramoenus
• (122) Rubus perangustus - Rubus pseudobayeri
• (123) Rubus pseudobellardii - Rubus robustifrons
• (124) Rubus robustiramus - Rubus semicondensatus
• (125) Rubus semicongestus - Rubus subalpinus var. apricus
• (126) Rubus subalpinus var. elongatiflorens - Rubus trigonodontos
• (127) Rubus trijugus - Rubus waddellii
• (128) Rubus wagae - Rudgea nebulicola
• (129) Rudgea nettoana - Ruellia oblongifolia
• (130) Ruellia obovata - Rumex crispus subsp. uliginosus
• (131) Rumex crispus uliginosus - Rumex x hybridus
• (132) Rumex x knafii - Ruschia scabra
• (133) Ruschia schneideriana - Rytidosperma dimidiatum
• (134) Rytidosperma distichum - Rzedowskia tolantonguensis