Plant morphology
Anthracite annual herb, high 5-20cm. Stalks slender, much branched, base basting, easy to take root after landing, glabrous or slightly finely hairy. Leaves alternate; sessile; leaf blade oblanceolate, 7-20 mm long, 3-5 mm wide, apex obtuse, margin irregularly sparse, glabrous, or subglabrous below. Capitulum small, oblate spheroid, ca. 3 mm in diam., solitary in leaf axils, without total pedicel or nearly total pedicel; involucre hemispherical; sepals 2-lamellar, elliptic-lanceolate, green, margin membranous, The outer layer is larger than the inner layer; the receptacle is flat, no support piece; floral heterogeneity, light yellow or yellow-green, all tubular; outer female flowers multi-layered, corolla fine, with indistinct lobes; central bisexual flowers, corolla is obvious 4 cracks. Achene elliptic, about 1mm long, with 4 edges, long hairy edges. After the whole grass is dry, people can sneeze for a long time.
In China, there is a general distribution. The flower is harvested from the 5th to the 10th month when it is not open or is open, and the whole planted grass is taken or dried after being cut into sections.
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