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Ranunculus Glaberrimus
- small early-flowering buttercup with shiny yellow flowers of western North America
Ranunculus Lingua
- semi-aquatic European crowfoot with spear-shaped leaves
Ranunculus Lyalii
- showy white-flowered perennial of New Zealand
Ranunculus Occidentalis
- perennial of western North America
Ranunculus Repens
- perennial European herb with long creeping stolons
Ranunculus Sceleratus
- annual herb growing in marshy places
Roman Coriander
- herb of the Mediterranean region having pungent seeds used like those of caraway
Rocky Mountain Dogbane
- North American plant similar to common dogbane
Rauwolfia Serpentina
- East Indian climbing shrub with twisted limbs and roots resembling serpents
Russian Thistle
- prickly bushy Eurasian plant; a troublesome weed in central and western United States