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Rosmarinus Officinalis
- widely cultivated for its fragrant gray-green leaves used in cooking and in perfumery
Rydberg's Penstemon
- plant with whorls of small dark blue-violet flowers; Washington to Wyoming and south to California and Colorado
Ricinus Communis
- large shrub of tropical Africa and Asia having large palmate leaves and spiny capsules containing seeds that are the source of castor oil and ricin; widely naturalized throughout the tropics
Regnellidium Diphyllum
- small latex-containing aquatic fern of southern Brazil
Rhizopogon Idahoensis
- a large whitish Rhizopogon that becomes grayish brown in maturity
Rhizopus Nigricans
- a mold of the genus Rhizopus
Rhizopus Stolonifer
- fungus causing soft watery rot in fruits and vegetables and rings of dry rot around roots of sweet potatoes
Rufous Rubber Cup
- a common name for a variety of Sarcosomataceae
Roccella Tinctoria
- a source of the dye archil and of litmus
Rhizoctinia Solani
- fungus causing a disease in potatoes characterized by black scurfy spots on the tubers