前言豆象属有30余种发现于欧洲和亚洲。通过商业活动,某些种随着多种食用或观赏用豆科植物的种籽传播到其他国家和地区。在美国的对外植物检疫中,先后截获到的就有13种之多。尽管有些种比较容易识别,但还有些近缘难于区分。应该提到的是,期望一个包括全部30余种,在任何场合都能满足需要的冗长的检索表,使用起来多有不便。一个有代表性的, Forever Begonia are more than 30 species found in Europe and Asia. Through commercial activities, some species spread to other countries along with many kinds of seeds for eating or ornamental legumes. In the United States of America’s foreign phytosanitary, has intercepted as many as 13 species. Although some are easier to identify, some are more difficult to distinguish. It should be mentioned that it is more inconvenient to expect a lengthy search form that includes more than 30 kinds of information that can meet the needs in any situation. A representative,