天山蓍 tian shan shi

Achillea trichophylla Schrenk ex Fischer & C. A. Meyer, Enum. Pl. Nov. 1: 48. 1841.

Herbs, perennial, 30-100 cm tall, with robust taproot; stem usually solitary, thick, striate, lower part densely dirty white lanate, upper part glabrescent. Basal leaves petiolate; leaf blade oblong, 5-30 × 2-12 cm, 3-pinnatisect, densely pilose; ultimate segments subfiliform, sessile, smaller. Synflorescence lax or dense, ± flat-topped. Involucres hemispheric, ca. 5 mm in diam.; phyllaries in 3 rows, oblong, scarious margin broad, adaxially sparsely villous. Florets many, yellow, tubular, 5-lobed, gland-dotted. Achenes yellow-brown, cuneate, 1-1.5 × 0.3-0.5 mm, with abaxial rim. Corona absent.

Xinjiang [Afghanistan, Kazakhstan, Pakistan, Uzbekistan].

The description above is based on specimens from Kazakhstan and Uzbekistan and on the account in Fl. URSS (26: 125. 1961).