About 175 species: most in the tropics and subtropics of America, ca. 70 species in Africa, widely introduced elsewhere; three species (introduced) in China.

 
  • 大约175种:多数生于美洲的热带和亚热带,约70种分布于非洲,在别处广泛引进栽培;中国有3种(均为引入栽培)。
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