R
Last updated October 1, 2009
| Name | Family | Nativity |
| Ranunculus sp. | Ranunculaceae | |
| Rauhia peruviana | Liliaceae | Peru |
| Rauvolfia caffra | Apocynaceae | South Africa |
| Rauvolfia samarensis | Apocynaceae | Philippines |
| Ravenea madagascariensis | Arecaceae | Madagascar |
| Ravenea monticola | Arecaceae | Madagascar |
| Ravenea rivularis | Arecaceae | Madagascar |
| Rebutia arenacea | Cactaceae | Bolivia(Cochabamba) |
| Rebutia canigueralii | Cactaceae | Bolivia |
| Rebutia peruviana | Cactaceae | |
| Reineckea carnea | Convallariaceae | China, Japan |
| Rhagodia spinescens v. deltophylla | Chenopodiaceae | S Australia |
| Rhamnus alaternus | Rhamnaceae | Portugal |
| Rhamnus californica cv. Eve Case | Rhamnaceae | California |
| Rhamnus californica cv. Eve Case | Rhamnaceae | Wester US |
| Rhamnus californicus | Rhamnaceae | W United States |
| Rhamnus californicus v. tomentella | Rhamnaceae | California |
| Rhaphidophora decursiva | Araceae | SE Asia |
| Rhapidophyllum hystrix | Arecaceae | SE United States |
| Rhapis excelsa | Arecaceae | S China |
| Rhapis humilis | Arecaceae | China |
| Rhipsalis cereuscula | Cactaceae | Cen Brazil to Uraguay |
| Rhipsalis cf. elliptica | Cactaceae | Brazil |
| Rhipsalis clavata | Cactaceae | SE Brazil |
| Rhipsalis crispa | Cactaceae | |
| Rhipsalis grandiflora | Cactaceae | Brazil |
| Rhipsalis micrantha | Cactaceae | Brazil |
| Rhipsalis micrantha | Cactaceae | Ecuador |
| Rhipsalis micrantha x naranja | Cactaceae | |
| Rhipsalis monacantha v. espinosa | Cactaceae | N Argentina |
| Rhipsalis pachyptera | Cactaceae | Brazil |
| Rhipsalis paradoxa | Cactaceae | Brazil |
| Rhipsalis paradoxa | Cactaceae | SE Brazil |
| Rhipsalis pentaptera | Cactaceae | S Brazil |
| Rhipsalis pilocarpa | Cactaceae | Brazil |
| Rhipsalis platycarpa | Cactaceae | Brazil |
| Rhipsalis rhombea | Cactaceae | Brazil |
| Rhipsalis sp. | Cactaceae | |
| Rhipsalis sulcata | Cactaceae | Brazil |
| Rhipsalis teres | Cactaceae | Brazil |
| Rhipsalis teres | Cactaceae | S Brazil |
| Rhododendron atlanticum | Ericaceae | North America |
| Rhododendron canescens | Ericaceae | North America |
| Rhododendron catawbiense x viscosum cv. Fragrans | Ericaceae | |
| Rhododendron cubittii cv. Ashcombe | Ericaceae | |
| Rhododendron cuffeanum | Ericaceae | |
| Rhododendron cv. Alaska | ericacaea | |
| Rhododendron cv. Anah Kruschke | Ericaceae | |
| Rhododendron cv. Angeles Crest | Ericaceae | |
| Rhododendron cv. Arthur Bedford | Ericaceae | |
| Rhododendron cv. Brilliant | ericacaea | |
| Rhododendron cv. Christmas Cheer | ericacaea | |
| Rhododendron cv. Chrysomanicum | Ericaceae | |
| Rhododendron cv. Corona | Ericaceae | |
| Rhododendron cv. Dame Nellie Melba | Ericaceae | |
| Rhododendron cv. Duc de Rohan | ericacaea | |
| Rhododendron cv. Fastuosum Flore Pleno | Ericaceae | |
| Rhododendron cv. Formosa | ericacaea | |
| Rhododendron cv. Forsterianum | Ericaceae | |
| Rhododendron cv. Fragrantissimum Improved | Ericaceae | |
| Rhododendron cv. George Budgen | Ericaceae | |
| Rhododendron cv. George Lindley Tabor | ericacaea | |
| Rhododendron cv. L. J. Bobbink | ericacaea | |
| Rhododendron cv. Loderi Ilam Cream | Ericaceae | |
| Rhododendron cv. Loder's White | Ericaceae | |
| Rhododendron cv. Mamie | ericacaea | |
| Rhododendron cv. Mexicali Rose | ericacaea | |
| Rhododendron cv. My Mary | Ericaceae | |
| Rhododendron cv. Percy Wiseman | Ericaceae | |
| Rhododendron cv. Pink Pearl | Ericaceae | |
| Rhododendron cv. Point Defiance | Ericaceae | |
| Rhododendron cv. Pride of Dorking | ericacaea | |
| Rhododendron cv. Princess Alexandra | Ericaceae | |
| Rhododendron cv. Rainbow | Ericaceae | |
| Rhododendron cv. Red Wing | ericacaea | |
| Rhododendron cv. Reine Long | Ericaceae | |
| Rhododendron cv. Roseum Elegans | ericacaea | |
| Rhododendron cv. Southern Charm | ericacaea | |
| Rhododendron cv. Tahitian Dream | Ericaceae | |
| Rhododendron cv. Tressa McMurry | Ericaceae | |
| Rhododendron cv. Van Nes Sensation | Ericaceae | |
| Rhododendron cv. Warlock | Ericaceae | |
| Rhododendron cv. White Pearl | Ericaceae | |
| Rhododendron formosum | Ericaceae | India |
| Rhododendron ponticum | Ericaceae | Europe and Asia |
| Rhododendron sp. | Ericaceae | |
| Rhododendron viscosum x prunifolium | Ericaceae | |
| Rhododendron x atlanticum | Ericaceae | |
| Rhombophyllum dolabriforme | Aizoaceae | South Africa |
| Rhopalostylis baueri | Arecaceae | Australia(Norfolk Is.) |
| Rhopalostylis sapida | Arecaceae | New Zealand |
| Rhus integrifolia | Anacardiaceae | S California to Baja, Ca |
| Rhus lentii | Anacardiaceae | Mexico |
| Rhus ovata | Anacardiaceae | California |
| Rhynchospora colorata | Cyperaceae | SE United States |
| Ribes viburnifolium | Saxifragaceae | S California to NW Mexico |
| Rohdea japonica | Convallariaceae | China, Japan |
| Rosa cv. Cinco de Mayo | Rosaceae | |
| Rosa cv. Hot Cocoa | Rosaceae | |
| Rosa cv. Julia Child | Rosaceae | |
| Rosa cv. Livin' Easy | Rosaceae | |
| Rosmarinus officinalis | Lamiaceae | Mediterranean |
| Rosmarinus officinalis cv. Lockwood de Forest | Lamiaceae | |
| Rosularia pallida | Crassulaceae | Cen Asia |
| Rotala indica | Lythraceae | Asia |
| Roystonea regia | Arecaceae | Cuba |
| Rudbeckia fulgida v. sullivantii cv. Goldstrum | Asteraceae | |
| Rudbeckia hirta | Asteraceae | E United States |
| Rudbeckia hirta cv. Cherokee Sunset | Asteraceae | |
| Ruellia brittoniana | Acanthaceae | Mexico |
| Ruellia macrantha | Acanthaceae | Brazil |
| Ruellia makoyana | Acanthaceae | Brazil |
| Ruellia sp. | Acanthaceae | |
| Rumohra adiantiformis | Polypodiaceae | Asia to Australia |
| Rumohra adiantiformis cv. Davis | Dryopteridaceae | |
| Ruschia centrocapsula | Aizoaceae | South Africa |
| Russelia equisetiformis | Scrophulariaceae | Mexico |
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Ganna Walska died March 2, 1984, at Lotusland, leaving her garden and her entire estate to the Ganna Walska Lotusland Foundation, to insure that her legacy would remain in her gardens.