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一年生草本。葉無柄,倒披針形至長橢圓倒卵形,長5-40 mm,羽狀脈,全緣或淺鈍鋸齒緣,兩面無毛,但葉緣粗糙。花單一,與葉對生,或頂生總狀花序,花梗較其對生葉短;花冠淺紫色;雄蕊2,假雄蕊2。蒴果遠長於萼片,長6-10 mm。