Quercus Oak 600 North temperate regions south to Malaysia and Colombia. Can be separated into White, Red and Live Oak Groups. Rapanea Cape Beech 150 Tropics. All species look alike. Robinia Locust 5 North America.
All species look alike.
Salix Willow 400 Cold and temperate regions. All species look alike. Sambucus Elder 20 Temperate and subtropical. All species look alike. Santalum Sandalwood 9 Indomalesia to Australia and Hawaii.