Species from Europe and western North America can sometimes be separated from the rest. Acacia Acacia 1200 Tropics. All species look alike. All species look alike. Aesculus Horse Chestnut 13 North America, eastern Europe, India and eastern Asia.
All species look alike.
Alnus Alder 35 North temperate regions south to southeast Asia and the Andes. All species look alike. Amyris Amyris 30 Tropical America. All species look alike. Andira Partridgewood 20 Tropical America and west Africa.