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Robert Mearns Yerkes
- United States psychologist who studied the intelligence of primates (1876-1956)
Richard Adolph Zsigmondy
- German chemist (born in Austria) honored for his research on colloidal solutions (1865-1929)
Rocky Mountain Pinon
- small compact 2-needled pinon of southwestern United States; important as a nut pine
Rocky Mountain Bristlecone Pine
- small slow-growing upland pine of western United States (Rocky Mountains) having dense branches with fissured rust-brown bark and short needles in bunches of 5 and thorn-tipped cone scales; among the oldest living things some over 4500 years old
Rockingham Podocarp
- large Australian tree with straight-grained yellow wood that turns brown on exposure
Ranunculus Acris
- perennial European buttercup with yellow spring flowers widely naturalized especially in eastern North America
Ranunculus Aquatilis
- plant of ponds and slow streams having submerged and floating leaves and white flowers; Europe and North America
Ranunculus Bulbosus
- perennial Old World buttercup with golden to sulphur yellow flowers in late spring to early summer; naturalized in North America
Ranunculus Ficaria
- perennial herb native to Europe but naturalized elsewhere having heart-shaped leaves and yellow flowers resembling buttercups; its tuberous roots have been used as a poultice to relieve piles
Ranunculus Flammula
- semi-aquatic Eurasian perennial crowfoot with spear-shaped leaves; naturalized in New Zealand