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Umbrella Plant
- African sedge widely cultivated as an ornamental water plant for its terminal umbrellalike cluster of slender grasslike leaves
- late blooming perennial plant of shale barrens of Virginia having flowers in flat-topped clusters
- rhizomatous perennial herb with large dramatic peltate leaves and white to bright pink flowers in round heads on leafless stems; colonizes stream banks in the Sierra Nevada in California
- African sedge widely cultivated as an ornamental water plant for its terminal umbrellalike cluster of slender grasslike leaves
- late-blooming perennial plant of shale barrens of Virginia having flowers in flat-topped clusters
- rhizomatous perennial herb with large dramatic peltate leaves and white to bright pink flowers in round heads on leafless stems; colonizes stream banks in the Sierra Nevada in California
Umbrella Sedge
- African sedge widely cultivated as an ornamental water plant for its terminal umbrellalike cluster of slender grasslike leaves
- African sedge widely cultivated as an ornamental water plant for its terminal umbrellalike cluster of slender grasslike leaves
Upland Cotton
- native tropical American plant now cultivated in the United States yielding short-staple cotton
- native tropical American plant now cultivated in the United States yielding short-staple cotton
Umbellales
- plants having umbels or corymbs of uniovulate flowers; includes the Umbelliferae (chiefly herbs) and Cornaceae (chiefly trees or shrubs)
Urticales
- an order of dicotyledonous plants including Moraceae and Urticaceae and Ulmaceae
Urticaceae
- a family of plants of order Urticales including many nettles with stinging hairs
Urtica
- a nettle yielding fiber resembling flax
Urtica Dioica
- perennial Eurasian nettle established in North America having broad coarsely toothed leaves with copious stinging hairs
Urtica Pipulifera
- annual European nettle with stinging foliage and small clusters of green flowers
Ulmaceae
- a dicot family of the order Urticales including: genera Ulmus, Celtis, Planera, Trema