Roscoea auriculata 'Beesiana' Rosmarinus officinalis
Rosmarinus officinalis 'Arp' Rosmarinus officinalis 'Benenden Blue'
Rosmarinus officinalis 'Huntington Carpet' Rosmarinus officinalis 'Irene™'
Rosmarinus officinalis 'Ken Taylor' Rosmarinus officinalis 'Lockwood De Forest'
Rosmarinus officinalis 'Majorca Pink' Rosmarinus officinalis 'Miss Jessop'
Rosmarinus officinalis 'Mozart' Rosmarinus officinalis 'Prostratus'
Rosmarinus officinalis 'Spice Island' Rosmarinus officinalis 'Tuscan Blue'
Rosularia aizoon Rotheca myricoides
Roystonea borinquena Roystonea elata
Roystonea hispaniolana Roystonea oleracea
Roystonea princeps Roystonea regia
Roystonea spp. Roystonea venezuelana
Rubus arcticus Rubus coccineanus 'Golden Vale'
Rubus cockburnianus Rubus idaeus
Rubus occidentalis 'Jewel' Rubus odoratus
Rubus pentalobus Rubus pentalobus 'Emerald Carpet'
Rubus spp. Rubus trifidus
Rudbeckia fulgida var. speciosa 'Newmanii' Rudbeckia fulgida var. speciosa 'Viette's Little Suzy'
Rudbeckia fulgida var. sullivantii 'Goldsturm' Rudbeckia hirta
Rudbeckia hirta 'Autumn Colors' Rudbeckia hirta 'Autumn Forest'
Rudbeckia hirta 'Becky' Rudbeckia hirta 'Cherokee Sunset'
Rudbeckia hirta 'Chim Chiminee' Rudbeckia hirta 'Cordoba'
Rudbeckia hirta 'Double Gold' Rudbeckia hirta 'Goldilocks'
Rudbeckia hirta 'Indian Summer' Rudbeckia hirta 'Irish Eyes'
Rudbeckia hirta 'Marmalade' Rudbeckia hirta 'Prairie Sun'
Rudbeckia hirta 'Quilled Petals Mix' Rudbeckia hirta 'Sonora'
Rudbeckia hirta 'Spotlight' Rudbeckia hirta 'Summer Light'
Rudbeckia hirta 'Toto®' Rudbeckia hirta 'Toto® Lemon'
Rudbeckia hirta 'Toto® Rustic' Rudbeckia laciniata
Rudbeckia laciniata 'Goldquelle' Rudbeckia maxima
Rudbeckia missouriensis Rudbeckia nitida 'Herbstsonne'
Rudbeckia subtomentosa Rudbeckia subtomentosa 'Henry Eilers'
Rudbeckia subtomentosa 'Quills' Rudbeckia triloba
Ruellia californica Ruellia caroliniensis
Ruellia elegans Ruellia elegans 'Ragin Cajin'
Ruellia macrantha Ruellia nudiflora
Ruellia peninsularis Ruellia simplex
Ruellia tweediana Ruellia tweediana 'Chi Chi'
Ruellia tweediana 'Katie Pink' Ruellia tweediana 'Purple Showers'
Rumex crispus Rumex sanguineus
Rumohra adiantiformis Ruschia dichroa
Ruschia pulchella Ruschia spinescens
Ruscus aculeatus 'Lanceolatus' Ruscus hypoglossum
Russelia equisetiformis Ruta graveolens
X Ruttyruspolia 'Phyllis van Heerden' Sabal bermudana
Sabal blackburniana Sabal causiarum
Sabal jamaicensis Sabal mauritiiformis
Sabal mexicana Sabal minor
Sabal palmetto Sabal parviflora
Sabal rosei Sabal uresana