Between 100 and 300 species: frigid and temperate regions of Africa, Asia, Europe, and America, extending to alpine areas in the tropics; three species in China.

• 在100和300种之间：在热带的非洲，亚洲，欧洲和美国，延伸到高山的地区的寒冷和温带的地区；中国有3种。