1、 Blade difference

The basal leaves of Aster are oblong or elliptic spoon shaped, and the lower half is gradually narrow and long handle, with a total length of 20-50 cm. The lower leaves are spoon shaped oblong, and the middle is oblong or oblong lanceolate. All leaves are thick paper

The leaves of purple calyx are ovate to ovoid, rarely cuneate at the base, and the petiole is about 6-30 cm long

2、 The difference between flowers

Aster mostly has head like inflorescence, long peduncle and wired bracts. Involucral bracts have 3 layers, which are linear or linear lanceolate. There are more than 20 tongue flowers, and the tongue is blue and purple

Purple calyx scape is about 60-100 cm high and has 10-30 flowers. Bracts are oblong lanceolate, white. When in full bloom, the perianth tube expands upward in a nearly funnel shape, and the color is purplish red