All species look alike. Some species can be separated. Species from Europe and western North America can sometimes be separated from the rest. Both genera and all species look alike. Fustet Cotinus 3 Southeast Asia, southern Europe to China.
All species look alike.
Hazel Corylus 10 North temperate. All species look alike. Hemlock Tsuga 10 Temperate North America and eastern Asia. All species look alike. Hickory Carya 17 Eastern North America, Central America and eastern Asia.