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扁蓿豆属植物在内蒙古主要分布于中东部地区。分布区年降水量为２５０～４５０ｍｍ，≥１０℃的积温为１４００～３０００℃，湿润度为０．２～０．８。该属的一个正种和三个变种各有其分布特点。
Phyllostains in Inner Mongolia are mainly distributed in the eastern region. The distribution of annual precipitation is 250 ~ 450mm, ≥ 10 ℃ accumulated temperature of 1400 ~ 3000 ℃, wettability of 0.2 ~ 0.8. One genus and one genus of the genus have their own distributional characteristics.