矮亚菊 ai ya ju

Chrysanthemum trilobatum (Poljakov) H. Ohashi & Yonekura.

Subshrubs, 5-15 cm tall; roots woody, ca. 1.5 cm in diam. Flowering and sterile branches gray-white, densely pubescent. Petiole ca. 1 cm; leaf blade suborbicular or flabelliform, 3-5 × 4-5 mm, both surfaces gray-white, densely pubescent, 2-palmatisect; primary lateral segments 3-6; ultimate segments ovate or elliptic, apex obtuse or rounded. Synflorescence a terminal flat-topped cyme. Capitula (1-)3-8(-10). Involucres campanulate, (4.5-)5-7(-8) mm in diam.; phyllaries in 3 rows, scarious margin brown, outer ones ovate, ca. 2 mm, abaxially sparsely pubescent, inner ones broadly elliptic to lanceolate, 2-4 mm, abaxially glabrous. Florets yellow; marginal female florets 5, corolla narrowly tubular, ca. 2 mm, apex 3-denticulate; disk florets many, corolla tubular, 2.2-3 mm. Achenes ca. 2 mm. Pappus absent. Fl. and fr. Jul-Aug.

● Fissures of rocks by rivers; ca. 3200 m. Xinjiang (C Tian Shan).