西藏亚菊 xi zang ya ju

Tanacetum tibeticum J. D. Hooker & Thomson ex C. B. Clarke, Compos. Ind. 154. 1876; Chrysanthemum tibeticum (J. D. Hooker & Thomson ex C. B. Clarke) S. Y. Hu.

Subshrubs, 4-20 cm tall. Old branches dark brown; young branches densely sericeous. Leaves petiolate; leaf blade elliptic or oblanceolate, 1-2 × 0.7-1.5 cm, both surfaces gray-white, densely tomentose, 2-pinnatisect; primary lateral segments 2-paired; ultimate segments narrowly elliptic; leaves below synflorescence pinnatifid. Synflorescence a terminal flat-topped panicle, 1-2 cm in diam. Involucres campanulate, 4-6 mm in diam.; phyllaries in 4 rows, apex obtuse, outer ones triangular-ovate or lanceolate, ca. 3 mm, abaxially sparsely sericeous, middle and inner ones elliptic or lanceolate-elliptic, 4-5 mm, middle ones sparsely sericeous, inner ones glabrous abaxially. Florets yellow; marginal female florets: corolla narrowly tubular, ca. 2.5 mm, apex 2-4-denticulate; disk florets many, corolla tubular. Achenes ca. 2.2 mm. Fl. and fr. Aug-Sep. 2n = 18.

Mountain slopes; 3900-4700 m. Sichuan, Xizang [India, Kazakhstan, Pakistan].