紫菀Aster,又名青菀、山白菜、驴耳朵菜等,为菊科、紫菀属多年生草本植物。紫菀株高150厘米左右,茎直立,单一,不分枝或上部少分枝,粗壮,疏生粗毛,基部有枯叶及不定根。叶互生,厚纸质。基生叶丛生,叶片较大,花期枯萎,边缘有锯齿,长圆形或椭圆状匙形;茎生叶无柄,披针形,全缘或有浅齿。头状花序,排列成复伞房状。花冠蓝紫色。花期7～9月,果期9～10月。 Aster Aster, also known as barley, mountain cabbage, donkey ear dishes, as Compositae, aster is a perennial herb. Aster about 150 cm tall, stem erect, single, unbranched or less branched at the top, stout, sparsely coarse hair, the base of dead leaves and adventitious roots. Leaves alternate, thick paper. Basal leaves clustered, larger leaves, blighted in flowering, margin serrate, oblong or elliptic-spatulate; stem leaves sessile, lanceolate, margin entire or with shallow teeth. Flower head, arranged into complex corymbose. Corolla blue-purple. Flowering from July to September, the fruit period from September to October.