188 
A GARDEN FLORA 
U 
ULEX. Leguminosae. 
U. europaeus. Furze, Gorse. W. and Central Europe, 
Britain. 
U. nanus. Dwarf Gorse. W. Europe. 
ULMUS. Elm. Urticaceae. 
U. alata. Wahoo, Winged Elm. E. United States. 
U. americana. American or White Elm. E. and Central 
North America. 
Height 34 feet. Planted in the Arboretum 1902. 
U. campestris. English Elm. S. England. 
„ var. Louis van Houtte. 
„ var. variegata. 
U. montana. Wych Elm, Scotch Elm. N. Europe, 
Britain, etc. 
U. montana, var. horizontalis. 
„ var. marginata. 
„ var. pendula. 
U. nitens, var. suberosa. Central Europe. 
Height 19 feet. Planted in the Arboretum 1902. 
U. serotina. S.E. United States. 
Height 7 feet. Planted in the Arboretum 1912. 
UMBELLULARIA. Lauracese. 
*U. calif ornica. Californian Laurel. California and 
Oregon. 
Syn. Oreodaphne califomica. 
Height 24 feet. A tree growing near the south 
wall. It flowers every year and occasionally fruits. 
The leaf when rubbed has a pungent smell : it 
contains cyanic acid, and when crushed in water 
forms prussic acid. 
UNGNADIA. Sapindacese. 
fU. speciosa. Spanish Buckeye. Mexico, Texas. 
