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. All species look alike. Sri Lanka to southern China. All species look alike. Sorbus Whitebeam 85 Northern hemisphere.