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Genera - U
Ulmus
Uniola (See Chasmanthium)
Urochloa
Urtica
Utricularia
Uvularia
ULEX (Family: Fabaceae)
ULEX EUROPAEUS Linnaeus - Common Gorse. 2n = (32), (64), 96.
Rocky headland turf, dry slopes, pine woods, usually in sandy soil. From Europe.
ULEX MINOR Roth - Dwarf Gorse. 2n = 32.
Sand plains. From Europe. [U. NANUS T.F. Forster ex Symons]
ULMUS (Family: Ulmaceae)
Ulmus americana Linnaeus - American Elm. 2n = 56.
Rich soil along streams, roadsides.
ULMUS GLABRA Hudson - Wych Elm. 2n = 28.
Roadsides, woodlands. From Eurasia.
ULMUS MINOR Miller - Smooth-leaved Elm. 2n = 28.
Roadsides. From Eurasia and northern Africa. [U. CARPINIFOLIA Gleditsch]
ULMUS PARVIFOLIA Jacquin - Chinese Elm. 2n = 28.
Roadsides. From eastern Asia.
ULMUS PROCERA Salisbury - English Elm. 2n = 28.
Roadsides. From Europe.
ULMUS PUMILA Linnaeus - Siberian Elm. 2n = 28.
Railroads, roadsides, woodland borders. From Asia.
Ulmus rubra Muhlenberg - Slippery Elm. 2n = 28.
Rich soil, often calcareous, often along streams.
Ulmus thomasii Sargent - Rock Elm. 2n = 28.
Calcareous ledges, rich upland woods.
UROCHLOA (Family: Poaceae)
UROCHLOA TEXANA (Buckley) R. D. Webster - Texas Millet. 2n = 36, 54.
Fields, waste places. From farther west [PANICUM TEXANUM Buckley]
URTICA (Family: Urticaceae)
URTICA DIOICA Linnaeus subsp. DIOICA - Stinging Nettle. 2n = (26), (48), 52.
Waste places, roadsides. From Eurasia.
Urtica dioica Linnaeus subsp. gracilis (Aiton) Selander - Wild Stinging Nettle. 2n = 26, 52.
Thickets, rich, damp soil, roadsides, waste places. [U. gracilis Aiton; U. procera Muhlenberg ex Willdenow; U. viridis Rydberg]
URTICA URENS Linnaeus - Dog Nettle. 2n = 24, 26.
Waste places, roadsides. From Eurasia.
UTRICULARIA (Family: Lentibulariaceae)
Utricularia cornuta Michaux - . 2n = 18.
Pond shores, bogs.
Utricularia geminiscapa Benjamin - . 2n = ?
Ponds, pools, sluggish streams.
Utricularia gibba Linnaeus - . 2n = ?
Ponds, pools, bogs. [U. biflora Lamarck; U. fibrosa Walter]
Utricularia inflata Walter - . 2n = 18, 36.
Ponds.
Utricularia intermedia Hayne - . 2n = (22), 44.
Ponds, pools, bogs, swamps.
Utricularia minor Linnaeus - . 2n = 36, 44.
Ponds, pools, wet meadows, bogs, shores.
Utricularia purpurea Walter - . 2n = ?
Ponds, sluggish streams.
Utricularia radiata Small - . 2n = ?
Ponds, sluggish streams. [U. inflata Walter var. minor Chapman]
Utricularia resupinata B.D. Greene ex Bigelow - . 2n = 44.
Shores of ponds, lakes and rivers.
Utricularia subulata Linnaeus - . 2n = ?
Sandy pond shores, swamps, in peat or leaf mold.
Utricularia vulgaris Linnaeus subsp. macrorhiza (Leconte) R.T. Clausen - . 2n = 36, 44.
Ponds and other quiet water. [U. vulgaris subsp. vulgaris misapplied]
UVULARIA (Family: Colchicaceae)
Uvularia grandiflora Smith - Big Merry-bells. 2n = 14.
Rich, moist woods and thickets, chiefly basic.
Uvularia perfoliata Linnaeus - Perfoliate Bellwort. 2n = 14.
Rich, usually dry, woods and thickets, preferring acid soils.
Uvularia sessilifolia Linnaeus - Wild-oats. 2n = 14.
Woods, thickets, clearings.
Designed by Ray Angelo. Revised Dec. 9, 2016