A twining, eastern Mexican vine(Exogonium purga)having tuberous roots that are dried, powdered, and used medicinally as a cathartic.

 
  • 球根牵牛,药喇叭一种墨西哥东部的缠绕藤本植物(外蕊属泻的),其块茎晒干并研成粉末可用作通便药
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