矮小假苦菜 ai xiao jia ku cai

Prenanthes pygmaea Ledebour, Mém. Acad. Imp. Sci. St. Pétersbourg Hist. Acad. 5: 553. 1815; Askellia nana (Richardson) W. A. Weber; Barkhausia nana (Richardson) Candolle; Crepis humilis Fischer ex Herder; C. nana Richardson; Hieracioides nana (Richardson) Kuntze; P. polymorpha Ledebour var. flaccida Ledebour; P. polymorpha subvar. integrifolia Ledebour; P. polymorpha var. lyrata Ledebour; P. polymorpha var. pygmaea (Ledebour) Ledebour; Youngia pygmaea (Ledebour) Ledebour; Y. pygmaea var. flaccida (Ledebour) Ledebour; Y. pygmaea var. lyrata (Ledebour) Ledebour; Y. pygmaea var. nana (Richardson) Ledebour.

Herbs 2-4 cm tall, perennial, glabrous, glaucescent. Roots shoot-bearing; subterranean shoots slender, often branched. Stem delicate, branched from base, leafy. Basal and stem leaves with a 4-14 mm petiole; leaf blade ovate, orbicular, or elliptic, 1-2.6[-3.5] × 0.4-1[-1.7] cm, base cuneate, margin entire, apex rounded to acute. Synflorescence tufted-corymbiform, with few to many capitula. Capitula with 9-11 florets; peduncle filiform, most shorter than involucre. Involucre narrowly cylindric, 9-10 × 2-3 mm. Phyllaries green, abaxially glabrous, margin scarious; outer phyllaries ovate to lanceolate, longest 2-3 mm, apex acute; inner phyllaries 8, apex ± acute. Florets yellow. Corolla 7-9 mm. Anther tube 2-2.5 mm. Achene pale yellowish, columnar to fusiform, ca. 5 mm, apically more strongly attenuate. Pappus 4-5 mm. Fl. and fr. Jun-Sep. 2n = 14.

Gravelly areas on floodplains and bases of slopes, stream banks; 4600-4700 m. Xinjiang, Xizang [Kazakhstan, Mongolia, E Russia; North America].