藏白蒿 zang bai hao

Herbs or subshrubs, caespitose, 15-25(-30) cm tall, with thick woody stock and branches, much branched, densely gray or yellowish tomentose. Basal and middle stem leaves: petioles 2-4 mm; leaf blades ovate, broadly ovate, or subreniform, 5-10 × 5-8 mm, 1(or 2)-pinnatisect; segments 2 or 3 pairs, entire or lobulate; lobes or lobules minute, lanceolate or elliptic-lanceolate, 1-2 × 0.5-1 mm. Uppermost leaves and leaflike bracts pinnatisect, 3-lobed, or entire. Synflorescence a broad panicle. Capitula nodding. Involucre hemispheric or broadly ovoid, (2.5-)3-4 mm in diam.; receptacle conical, pubescent. Marginal female florets 4-8. Disk florets 8-14; corolla limb purple, glabrous. Achenes obovoid-ellipsoid. Fl. and fr. Jul-Oct.

● Canyons, hills, rocky slopes, waysides; 4000-4700 m. Xizang.