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| rabbitwood also called oil nut, buffalo nut, pyrularia pubera |
| radicchio also called chicory, succory, witloof, cichorium intybus, cichorium intybus var. foliosum |
| radish |
| rajania also called dioscorea, borderea, nanarepenta, tamus |
| ramtil also called niger seed, niger, ramtilla, werinnua, guizotia abyssinica |
| ramtilla also called niger seed, niger, ramtil, werinnua, guizotia abyssinica |
| ranunculaceae |
| ranunculus |
| ranunculus acer also called tall buttercup, cmmon buttercup, ranunculus acris |
| ranunculus acris also called tall buttercup, cmmon buttercup, ranunculus acer |
| rape also called oilseed rape, rapeseeds, brassica napus |
| rapeseeds also called rape, oilseed rape, brassica napus |
| raphanus raphanistrum |
| raphanus sativus |
| rauvolfia serpentina also called serpentwood, devilpepper, rauwolfia serpentina |
| rauwolfia serpentina also called serpentwood, devilpepper, rauvolfia serpentina |
| recchia |
| red bryony |
| red campion also called morning campion, silene dioica |
| red cedar |
| red clover also called peavine clover, purple clover, rotklee, trifolium pratense |
| red goosefoot also called pigweed, chenopodium rubrum |
| red mulberry |
| red oak also called northern red oak, quercus rubra |
| red pepper also called chilli pepper, pimento, sweet pepper, capsicum annuum var. annuum |
| red pine also called canadian red pine, norway pine, pinus resinosa |
| red sorrel also called common sorrel, sheep sorrel, rumex acetosella |
| red stem pokeweed also called american pokeweed, virginia poke, common pokeberry, common pokeweed, phytolacca americana |
| red-sorrel also called roselle, sereni, hibiscus sabdariffa |
| redwood also called california redwood, sequoia sempervirens |
| ren seng also called chinese ginseng, korean ginseng, ginseng, hong shen, insam, ninjin, panax ginseng |
| renata |
| resnova |
| rhamnales also called rosales, rosanae, urticales |
| rheedia also called garcinia, pentaphalangium |
| rheum |
| rheum officinale |
| rheum palmatum |
| rheum x cultorum |
| rhubarb |
| rhus |
| ribes |
| ribes nigrum |
| ribgrass also called narrow-leaved plantain, plantago lanceolata |
| ribworts also called plantains, plantago |
| rice also called oryza sativa, oryza sativa l. |
| ricimus communis also called castor bean, ricinus communis, ricinis communis |
| ricinis communis also called castor bean, ricinus communis, ricimus communis |
| ricinus |
| ricinus communis also called castor bean, ricimus communis, ricinis communis |
| rivet wheat also called english wheat, cone wheat, poulard wheat, triticum turgidum, triticum turgidum8 |
| robinia |
| robinia pseudoacacia |
| robusta coffee also called coffea canephora, coffea robusta |
| rock cherry also called mahaleb cherry, prunus mahaleb |
| rockcress |
| rocket candytuft also called gruetzblume, bitter candytuft, teraspic, iberis amara |
| rocotillo also called scotch bonnet, bonnet pepper, habanero, capsicum chinense |
| rosa |
| rosa hybrid cultivar also called rosa hybrida, rosa x hybrida |
| rosa hybrida also called rosa hybrid cultivar, rosa x hybrida |
| rosa multiflora |
| rosa sp. |
| rosa x hybrida also called rosa hybrid cultivar, rosa hybrida |
| rosales also called rhamnales, rosanae, urticales |
| rosanae also called rosales, rhamnales, urticales |
| rosary pea also called indian licorice, crab's eye, crab's-eye, abrus precatorius, abrus cyaneus |
| rose balsam also called garden balsam, impatiens balsamina |
| rose-bay also called common oleander, nerium oleander |
| roselle also called red-sorrel, sereni, hibiscus sabdariffa |
| rosemallows |
| rosemary |
| rosmarinus |
| rosmarinus officinalis |
| rosy periwinkle also called madagascar periwinkle, old-maid, catharanthus roseus, vinca rosea |
| rotklee also called peavine clover, purple clover, red clover, trifolium pratense |
| rowan also called european mountain ash, quickbeam, sorbus aucuparia |
| rubbertree also called para rubber tree, jebe, siringa, hevea brasiliensis |
| rubia |
| rubus |
|