伞房菊蒿 san fang ju hao

Pyrethrum tanacetoides Candolle, Prodr. 6: 59. 1838; Chrysanthemum tanacetoides (Candolle) B. Fedtschenko.

Herbs, perennial, 20-85 cm tall, with branched rhizomes; stems erect, solitary or fascicled, upper parts corymbosely branched, sparsely pilose with T-shaped and simple hairs. Basal leaves: petiole 6-9 cm; leaf blade elliptic, ca. 10 × 2.5 cm, 2-pinnatisect, both surfaces green or gray-green, sparsely pilose; primary lateral segments 10-15-paired; ultimate segments linear or ovate. Stem leaves similar, sessile; uppermost leaves pinnatisect. Synflorescence a lax flat-topped panicle. Capitula 3-10(-18); peduncle slender, 2-5 cm. Involucre campanulate; phyllaries in 4 rows, abaxially villous or pubescent with long or short hairs, outer and middle ones triangular-lanceolate or narrowly lanceolate, 2-4.5 mm, apex scarious-ampliate, inner ones linear-elliptic, ca. 4 mm. Ray florets white, apex 3-denticulate. Achenes ca. 2.5 mm. Corona 0.1-0.3 mm, margin denticulate. Fl. and fr. Jun-Aug.

Rocky slopes; 500-1800 m. Xinjiang (Altay Shan) [Kazakhstan, Russia].