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Rheum Rhabarbarum
- long-cultivated hybrid of Rheum palmatum; stems often cooked in pies or as sauce or preserves
Rheum Rhaponticum
- long-cultivated hybrid of Rheum palmatum; stems often cooked in pies or as sauce or preserves
Rheum Palmatum
- long used for laxative properties
Rumex Acetosa
- European sorrel with large slightly acidic sagittate leaves grown throughout north temperate zone for salad and spring greens
Rumex Acetosella
- small plant having pleasantly acid-tasting arrow-shaped leaves; common in dry places
Rumex Obtusifolius
- European dock with broad obtuse leaves and bitter rootstock common as a weed in North America
Rumex Scutatus
- low perennial with small silvery-green ovate to hastate leaves
Rosa Pendulina
- European alpine rose with crimson flowers
Rosa Spithamaea
- low-growing bristly shrub of southern Oregon and California with creeping rootstocks and usually corymbose flowers
Rosa Banksia
- Chinese evergreen climbing rose with yellow or white single flowers