A GARDEN FLORA 161 
R. Cotinus. Venetian Sumach. Central and S. Europe 
to Himalaya. 
R. Cotinus, var. atropurpurea. 
R. glabra. Smooth Sumach. E. United States. 
R. Osbeckii. China and Japan. 
Height 9 feet. A spreading shrub, in an open 
position. 
R. Potaninii. N. China. 
Height 12 feet. Planted in the Arboretum 
1913. 
R. Toxicodendron. Poison Ivy. N. America. 
R. typhina. Stag’s-horn Sumach. E. North America. 
Height 16 feet. A staminate tree, planted in the 
Arboretum 1902. 
R. vemicifera. Lacquer Tree. Central and W. China 
and perhaps Japan. 
This tree is used extensively by the Japanese. 
We have found it quite hardy, and a rapid grower, 
often making a growth of 3 feet in a season. The 
tree is now 20 feet high, and has been in the open 
seven years. (1916.) 
RIBES. Currants and Gooseberries. Saxifragaceee. 
R. alpinum. Alpine Currant. N. Hemisphere (Old 
World), Britain. 
R. americanum. American Currant. E. North America. 
Syn. R. floridum. 
R. aureum. Buffalo Currant. Central United States. 
R. gordonianum (sanguineumx aureum). Garden origin. 
R. lacustre. N. America. 
**R. laurilolium. N.W. China. 
R. Lobbii. N. California and S. British Columbia. 
A slow growing little shrub, with an attractive 
flower, the petals pink and the calyx red. 
R. prostratum. N. America. 
R. sanguineum. Flowering Currant. W. North America. 
„ var. atrorubens. 
„ var. atrosanguineum. 
„ var. carneum. 
M 
