拟天山蓍 ni tian shan shi

Tanacetum umbelliferum Boissier, Diagn. Pl. Orient., ser. 2, 3: 30. 1856; Chrysanthemum floccosum Kitamura; C. trichophyllum (Regel & Schmalhausen) Kuntze; C. umbelliferum (Boissier) Hoffmann; Lepidolopsis umbellifera (Boissier) Poljakov; Pyrethrum trichophyllum (Regel & Schmalhausen) Bornmüller & Sintenis (1900-1901), not Grisebach (1846); P. umbelliferum (Boissier) Boissier; T. trichophyllum Regel & Schmalhausen.

Herbs, biennial or short-lived perennial, dying after flowering, 20-100 cm tall, roots long and thick; stems solitary or few, robust, unbranched below synflorescence, base covered with persistent leaf bases; most parts densely arachnoid hairy. Leaf blade to 30 × 5-6 cm, bipinnate, ultimate segments linear, to 0.6 mm wide, with cartilaginous cusp. Synflorescence umbel-like. Capitula many, long pedunculate. Involucres hemispheric, 3-5 × 6-9 mm; outer phyllaries oblong, margin broadly scarious, erose; innermost phyllaries much narrower. Florets many; corolla yellow, with linear tube and abruptly expanded campanulate limb, 5-lobed, strongly glandular papillate. Achenes cylindric, 1.8-2.4 × ca. 0.3 mm, obscurely 4- or 5-ribbed, tuberculate, glandular. Corona absent.

Stony slopes, sands, gravel beds, etc. Xinjiang [Afghanistan, Kazakhstan, Tajikistan, Turkmenistan; SW Asia (Iran)].

No material from China was seen by the present authors. The description is based primarily on the account in Fl. URSS.