贺兰山女蒿 he lan shan nü hao

Tanacetum kaschgaricum Krascheninnikov, Trudy Bot. Inst. Akad. Nauk S.S.S.R., Ser. 1, Fl. Sist. Vyssh. Rast. 1: 175. 1933; Chrysanthemum alashanense (Y. Ling) Y. Ling; Hippolytia alashanensis (Y. Ling) C. Shih; Poljakovia alashanensis (Y. Ling) Grubov & Filatova; P. kaschgarica (Krascheninnikov) Grubov & Filatova; T. alashanense Y. Ling.

Subshrubs or small shrubs, 25-50 cm tall; old branches dark gray or gray-brown; branchlets of current year somewhat gray-white, indumentum dense and appressed powdery. Leaves in basal rosettes and scattered along stems; petiole 3-8 mm; leaf blade narrowly elliptic, lanceolate, or elliptic, 1.5-2 × 0.5-1 cm, pinnatipartite, abaxially gray-white, densely appressed pubescent, adaxially green, glabrescent; lateral lobes 2-5-paired, all lobe margins entire or 1- or 2-toothed on one side; leaves below synflorescences sometimes simple, entire. Synflorescence a dense terminal flat-topped cyme; capitula 3-10, peduncle 0.5-1.5 cm, pubescent with appressed white powdery hairs. Involucre campanulate, 4-5 mm in diam.; phyllaries in 4 rows, rigidly herbaceous, glossy, yellowish or straw-colored, scarious margin brown or white, outer phyllaries lanceolate, ca. 1.8 mm, middle and inner ones oblanceolate, ca. 3 mm. Florets yellow, ca. 2 mm. Achenes ca. 1.5 mm. Fl. and fr. Aug-Oct.

● Mountain slopes, fissures of rocks, grasslands, desert steppes; 1900-2300 m. Gansu, Nei Mongol, Ningxia, Xinjiang.

Tzvelev (Fl. URSS 26: 412. 1961) suggested that this species would have to be removed from Hippolytia. Bremer and Humphries (Bull. Nat. Hist. Mus. London, Bot. 23: 106. 1993) also regarded this species as anomalous, and it was subsequently transferred by Grubov and Filatova to the new genus Poljakovia (Novosti Sist. Vyssh. Rast. 33: 227. 2001).

Filatova (Rast. Tsentral. Azii 14a: 30-31. 2007) treated Hippolytia alashanensis and H. kaschgarica as distinct species in Poljakovia: P. alashanensis with lower cauline leaves and leaves of sterile shoots pinnatisect, lateral segments linear, apex shortly cuspidate; and P. kaschgarica with lower cauline leaves and leaves of sterile shoots pinnatifid, lateral segments oblong-lanceolate, entire, apex subobtuse.