圆叶蒲儿根 yuan ye pu er gen

Herbs, scapigerous. Rhizomes stout, clad in persistent petiole bases, densely sericeous-lanate, with few fibrous roots. Stems solitary, erect, purplish, scapiform, ca. 20 cm tall, simple, sparsely fulvous pubescent in upper part. Radical leaves rosulate, long petiolate; petiole 3-5 cm, slender, basally expanded, brown sericeous-lanate; blade abaxially pale green, adaxially green or deep green, orbicular or rarely reniform-orbicular, 1.5-2 × 1.5-2 cm, abaxially sparsely fulvous arachnoid, glabrescent to glabrous, adaxially glabrous, palmately 5-7-veined, veins ± raised abaxially, base cordate, margin subentire or sometimes repand, teeth mucronulate, apex rounded. Capitula terminal, solitary, radiate, 1.5-2 cm in diam. Involucres campanulate, 6-7 × 7-8 mm, not calyculate, densely tomentose below capitulum; phyllaries 13-15, oblong-lanceolate, 1-1.5 mm wide, glabrous, margin narrowly scarious, apically acuminate, purplish, puberulent. Ray florets 11-13, rarely 15; tube 3-3.5 mm; lamina yellow, oblong, 2.5-3 mm wide, 4-veined, apically denticulate. Disk florets numerous; corolla yellow, 5-6 mm, with ca. 2 mm tube and campanulate limb; lobes ovate-lanceolate, apically acuminate, puberulent. Anthers oblong, 2.5-3 mm, basally obtuse. Style branches recurved, apically truncate, papillose. Achenes cylindric, ca. 3 mm, smooth, glabrous, ribbed. Pappus white, 5-6 mm. Fl. May-Jun, fr. Jun-Jul. 2n = 60*.

● Woods, in bushes; 2400-3000 m. Gansu (Wenxian), Sichuan (Songpan).

Sinosenecio rotundifolius is somewhat similar to S. dryas in leaf shape and the solitary capitula, but it differs by its rhizomes with short internodes and stem without bracts. In S. dryas, the rhizomes have very long internodes, and the stem bears 3-5 lanceolate bracts. The two species also differ in habitat preference and geographical range.