RANUNCULUS aconitifolius ‘Flore Pleno’
RANUNCULUS bulbosus ‘F.M. Burton’
RANUNCULUS caucasicus
RANUNCULUS serbicus
RANUNCULUS acris ‘Flore Pleno’
RANUNCULUS ficaria ‘Brazen Hussy’
RANUNCULUS baurii
RANUNCULUS constantinopolitanus ‘Plenus’
RANUNCULUS ficaria aurantiacus
RAOULIA ex. New Guinea
RASPBERRY ‘Glen Prosen’
RASPBERRY ‘Autumn Bliss’
RASPBERRY ‘Malling Jewel’
REDCURRANT ‘Red Lake’
REDCURRANT ‘Laxton’s No 1’
REINECKEA carnea
RHAMNUS alaternus ‘Argenteovariegata’
RHEUM moorcroftianum
RHEUM officinale
RHEUM palmatum
RHEUM palmatum tanguticum
RHEUM alexandrae
RHEUM australe
RHEUM kialense
RHEUM delavayi
RHEUM tibeticum
RHEUM tataricum
RHEUM alexandrae hybrids
RHEUM kialense hybrid
RHEUM ‘Ace of Hearts’
RHODEA japonica
RHODIOLA rosea
RHODIOLA coccinea
RHODIOLA species ex India
RHODIOLA fastigiata
RHODIOLA linearifolia
RHODODENDRON cinnabarinum
RHODODENDRON luteum
RHODOPHIALA elwesii
RHODOPHIALA species ex Chile
RHUS typhina
RIBES speciosum
RIBES laurifolium
RIBES alpinum ‘Aureum’
RICHEA scoparia
ROBINIA pseudoacacia ‘Umbraculifera’
RODGERSIA aesculifolia
RODGERSIA ex. China
RODGERSIA ‘Herkules’
RODGERSIA hybrid
RODGERSIA New Hybrids
RODGERSIA pinnata ‘Alba’
RODGERSIA pinnata ‘Crûg Cardinal’
RODGERSIA pinnata ‘Superba’
RODGERSIA pinnata white-flowered
RODGERSIA podophylla ‘Rotlaub’
RODGERSIA purdomii
RODGERSIA sambucifolia
RODGERSIA sambucifolia ‘Mountain Select’
RODGERSIA species
RODGERSIA superba ex. ‘Pinnata’
RODGERSIA ‘Irish Bronze’
RODGERSIA podophylla
RODGERSIA aesculifolia ex Shanghai
RODGERSIA ‘Cally Rose’
RODGERSIA superba seedlings
RODGERSIA pinnata
RODGERSIA pinnata ‘Cally Hybrids’
RODGERSIA pinnata ‘Cally Salmon’
RODGERSIA podophylla ‘Smaragd’
ROMNEYA coulteri
ROSA ‘Carmenetta’
ROSA ‘Climbing Lady Hillingdon’
ROSA ‘Climbing Pompon de Paris’
ROSA ‘Cooperi’
ROSA ‘Cosimo Ridolfi’
ROSA ‘Easlea’s Golden Rambler’
ROSA fedtschenkoana
ROSA ‘Félicité Perpétue’
ROSA helenae
ROSA longicuspis sinowilsonii
ROSA ‘Paulii’
ROSA pimpinellifolia
ROSA pimpinellifolia ‘William III’
ROSA ‘The Fairy’
ROSA virginiana
ROSA ‘Wickwar’
ROSA ‘Henri Martin’
ROSA nitida
ROSA ‘Golden Showers’
ROSA ‘Madame Alfred Carrière’
ROSA ‘Ferdinand Pichard’
ROSA ‘Madame Hardy’
ROSA ‘Dupontii’
ROSA pimpinellifolia ‘Nana’
ROSA moyesii rosea
ROSA pimpinellifolia ex. ‘William III’
ROSA centifolia ‘Cristata’
ROSA ‘Kazanlik’
ROSA pimpinellifolia ‘Grandiflora’
ROSA pimpinellifolia ‘Single Cherry’
ROSA ‘Agnes’
ROSA sweginzowii
ROSA ‘Etoile de Hollande’
ROSA odorata ‘Viridiflora’
ROSCOEA ‘Beesiana’
ROSCOEA cautleyoides ‘Jeffrey Thomas’
ROSCOEA cautleyoides ‘Kew Beauty’
ROSCOEA cautleyoides ‘Reinier’
ROSCOEA tibetica
ROSCOEA cautleyoides
ROSCOEA scillifolia
ROSCOEA cautleyoides ex. ‘Kew Beauty’
ROSCOEA purpurea ‘Peacock’
ROSCOEA purpurea
ROSCOEA auriculata
ROSMARINUS officinalis ‘McConnell’s Blue’
RUBUS cockburnianus ‘Goldenvale’
RUBUS irenaeus
RUBUS spectabilis ‘Olympic Double’
RUBUS thibetanus
RUBUS henryi bambusarum
RUDBECKIA laciniata
RUDBECKIA fulgida deamii
RUDBECKIA subtomentosa
RUMEX flexuosus
RUSCUS aculeatus ‘Lanceolatus’
RUSCUS ponticus
RUSCUS microglossum
RUSCUS hypoglossum
RUSCUS aculeatus
RUSCUS aculeatus ex. Hermaphrodite Form
RUSCUS aculeatus hermaphrodite