week-stemmed winter annual native to Mediterranean region for long established in southern United States; cultivated as a cover and pasture crop
英
美
- 茎细弱并常外倾地面上而枝端向上、冬季结荚果的一种豆；原产于地中海地区，但作为一个归化种而在美国南部长期栽种，最近又作为覆盖作物和牧草而栽培
