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Russian Tumbleweed
- prickly bushy Eurasian plant; a troublesome weed in central and western United States
Russian Cactus
- prickly bushy Eurasian plant; a troublesome weed in central and western United States
Rivina Humilis
- bushy houseplant having white to pale pink flowers followed by racemes of scarlet berries; tropical Americas
Rocky Mountain Bee Plant
- plant of western North America having trifoliate leaves and white or pink spider-shaped flowers; sometimes used as an ornamental
Rose Of Jericho
- small gray Asiatic desert plant bearing minute white flowers that rolls up when dry and expands when moist
- densely tufted fern ally of southwestern United States to Peru; curls up in a tight ball when dry and expands and grows under moist conditions
Rorippa Nasturtium-Aquaticum
- perennial Eurasian cress growing chiefly in springs or running water having fleshy pungent leaves used in salads or as a potherb or garnish; introduced in North America and elsewhere
Raphanus Raphanistrum
- Eurasian weed having yellow or mauve or white flowers and podlike fruits
Raphanus Sativus
- Eurasian plant widely cultivated for its edible pungent root usually eaten raw
Raphanus Sativus Longipinnatus
- radish of Japan with a long hard durable root eaten raw or cooked
Rorippa Islandica
- annual or biennial cress growing in damp places sometimes used in salads or as a potherb; troublesome weed in some localities