About 60 genera: temperate and cold regions of the world, extending to mountains in the tropics; 20 genera, one hybrid genus, and 144 species (40 endemic, 11 or 12 introduced) in China.

• 大约60属：世界的温带和冷的地区，在热带的延伸到山；20属，属一杂种，和144种(特有，引进栽培的1211或在中国内。