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Genus Ricinus
- noun - a genus of herb having only one known species: castor-oil plant
Genus Riparia
- noun - a genus of Hirundinidae
Genus Robinia
- noun - deciduous flowering trees and shrubs
Genus Rodolia
- noun - genus of Australian ladybugs
Genus Romneya
- noun - 1 species: matilija poppy
- one species: matilija poppy
Genus Rorippa
- noun - annual and perennial herbs of damp habitats; cosmopolitan except Antarctica
Genus Rumohra
- noun - leatherleaf ferns: in some classifications included in genus Polystichum
Genus Russula
- noun - large genus of fungi with stout stems and white spores and neither annulus nor volva; brittle caps of red or purple or yellow or green or blue; differs from genus Lactarius in lacking milky juice