丝叶匹菊 si ye pi ju

Pyrethrum abrotanifolium Bunge ex Ledebour, Fl. Ross. 2: 549. 1845; Chrysanthemum abrotanifolium (Bunge ex Ledebour) Krylov.

Herbs, perennial, 30-60 cm tall, with thick rhizomes; stems solitary, erect, upper parts branched, very sparsely pilose or glabrous. Basal and lower stem leaves: petiole 3-5 cm; leaf blade narrowly elliptic or linear-elliptic, ca. 14 × 2-4 cm, 2-pinnatisect, both surfaces green, sparsely villous with glandular and long, curved, simple hairs; primary lateral segments 7-15-paired; ultimate segments filiform. Middle and upper stem leaves similar, gradually smaller, sessile. Synflorescence an irregular flat-topped panicle. Capitula 3-7, pedunculate. Involucre coryliform, 9-11 mm in diam.; phyllaries in 4 rows, scarious margin brown or dark brown, outer phyllaries lanceolate, ca. 3.5 mm, abaxially sparsely pilose, middle and inner ones narrowly elliptic to linear-elliptic, 4-5 mm, abaxially glabrous. Ray florets white; lamina narrowly elliptic, 8-12 mm. Achenes ca. 2.2 mm. Corona 0.3-0.5 mm, lobed or divided to 1/2 length. Fl. and fr. Jul-Aug.

Mountain slopes; above 2000 m. Xinjiang [Kazakhstan, Mongolia, Russia].