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Roman Nettle
- annual European nettle with stinging foliage and small clusters of green flowers
Roman Hyacinth
- hyacinth with loosely flowered spikes, several growing from one bulb
Ruscus Aculeatus
- shrub with stiff-pointed flattened stems resembling leaves (cladophylls); used for making brooms
Red Clintonia
- plant with nearly leafless stalk topped by an umbellike cluster of red or reddish lavender flowers; California to Oregon
Retama Raetam
- desert shrub of Syria and Arabia having small white flowers; constitutes the juniper of the Old Testament; sometimes placed in genus Genista
Robinia Hispida
- large shrub or small tree of the eastern United States having bristly stems and large clusters of pink flowers
Robinia Pseudoacacia
- large thorny tree of eastern and central United States having pinnately compound leaves and drooping racemes of white flowers; widely naturalized in many varieties in temperate regions
Robinia Viscosa
- small rough-barked locust of southeastern United States having racemes of pink flowers and glutinous branches and seeds
Raffia Farinifera
- a large feather palm of Africa and Madagascar having very long pinnatisect fronds yielding a strong commercially important fiber from its leafstalks
Raffia Ruffia
- a large feather palm of Africa and Madagascar having very long pinnatisect fronds yielding a strong commercially important fiber from its leafstalks