| Rhaphiolepis japonica Japansk lagerkvitten |
| Rhapis excelsa Buskpalm |
| Rhaponticum scariosum ssp. rhaponticum Rabarberklint |
| Rheum palmatum Flikrabarber |
| Rheum rhabarbarum Rabarber |
| Rheum rhaponticum Munkrabarber |
| Rheum tataricum Stäpprabarber |
| Rheum tibeticum |
| Rheum wittrockii |
| Rhipsalis dissimilis |
| Rhipsalis mesembryanthemoides Middagsblommekaktus |
| Rhipsalis micrantha |
| Rhipsalis neves-armondii |
| Rhipsalis oblonga |
| Rhipsalis paradoxa Tumstockskaktus |
| Rhipsalis teres |
| Rhizophora mangle Amerikansk mangrove |
| Rhodiola pachyclados Rosettfetblad |
| Rhodochiton atrosanguineum Törnrosas kjortel |
| Rhodocoma foliosa |
| Rhododendron 'Hachmann's Polaris' |
| Rhododendron 'Jolie Madame' |
| Rhododendron 'Sachsenstern' |
| Rhododendron 'Weston's Innocence' |
| Rhododendron 'Weston's Sparkler' |
| Rhododendron albrechtii Kejsarazalea |
| Rhododendron auriculatum Öronrododendron |
| Rhododendron calophytum Paraplyrododendron |
| Rhododendron camtschaticum Kamtjatka-azalea |
| Rhododendron impeditum Tuvalpros |
| Rhododendron niko-montanum Liten fujirododendron |
| Rhododendron orbiculare Rundbladsrododendron |
| Rhododendron pachytrichum Fjunrododendron |
| Rhododendron principis Prinsrododendron |
| Rhododendron prinophyllum Rosenazalea |