密头菊蒿 mi tou ju hao

Pyrethrum crassipes Stscheglejew, Bull. Soc. Imp. Naturalistes Moscou 27: 172. 1854; Chrysanthemum crassipes (Stscheglejew) B. Fedtschenko.

Herbs, perennial, 20-60 cm tall, with branched rhizomes; stems solitary or fascicled, upper parts corymbosely branched, sparsely pilose with T-shaped and simple hairs. Basal leaves: petiole 3-5 cm; leaf blade narrowly elliptic, 8-15 × ca. 2 cm, 2-pinnatisect, green or deep green, appressed pilose; primary lateral segments 10-15-paired; ultimate segments linear-elliptic. Stem leaves similar, few, sessile. Synflorescence a dense flat-topped cyme. Capitula 3-7; peduncle 0.5-1.5 cm, apex thicker. Involucre campanulate, 7-10(-14) mm in diam.; phyllaries in 3 or 4 rows, abaxially with simple hairs, outer and middle phyllaries lanceolate, 2.5-4 mm, apex scarious-ampliate, inner ones narrowly linear-elliptic, ca. 4 mm. Ray florets yellow, apex 3-denticulate. Achenes ca. 2 mm. Corona ca. 0.3 mm, margin denticulate. Fl. and fr. Jun-Aug.

Rocky slopes, forest understories, grasslands; ca. 2100 m. Xinjiang (Altay Shan) [Kazakhstan, Russia].