FAMILIES OF FLOWERING PLANTS 203 
Canadensis) and its close relative, C, Suecica. Another common species 
along streams and swamps is the red-osier dogwood (C. stolonifera). 
The genus Nyssa includes mainly trees, N. sylvatica, being the pepperidge, 
sour gum or tupelo, NV. biflora, the water tupelo, and NV. aquatica, the 
cotton or tupelo gum. Aucuba Japonica, a glossy, evergreen shrub from 
Japan, is common in cultivation. Garrya is the only other North 
American genus. 
