Radermachera yunnanensis
Raphanus raphanistrum
Wild Radish
Ravenala madagascariensis
East-West Palm
Ricinus communis
Castor-oil-plant
Rivini humilis
Bloodberry
Rubus fraxinifolius
Mountain Raspberry
Ruella simplex
Mexican Petunia
Ruellia simplex
Mexican Petunia
Ruellia tuberosa
Minnieroot
Salvia farinacea
Mealy Sage
Salvia involucrata
Rosy-leaf sage
Salvia leucanthe
Mexican Bush Sage
Salvia splendens
Bonfire Salvia
Samanea saman
Raintree
Sambucus canadensis
American Elderberry
Sanchezia oblonga
Zebra Plant
Sandoricum koetjape
Santol
Schaueria calytricha
Golden Plume
Schismatoglottis calyptrata
Dukaruk
Scindapsus pictus
Satin Pothos
Scutellaria incarnata
Hoary Skullcap
Seemannia sylvatica
Bolivian Sunset Gloxinia
Selaginella martensii
Variegated Spikemoss
Selaginella willdenowii
Willdenow's Spikemoss