贡山假升麻 gong shan jia sheng ma

Pleiosepalum gombalanum Handel-Mazzetti, Anz. Akad. Wiss. Wien, Math.-Naturwiss. Kl. 59: 139. 1922; Aruncus dioicus (Walter) Fernald var. rotundifoliolatus H. Hara.

Plants to 70 cm tall. Rhizome thick, woody. Stems red-brown, slightly pubescent above, glabrous below. Leaves 1- or 2-pinnate or 1- or 2-ternate; petiolules absent or terminal leaflets shortly petiolulate; leaflets suborbicular or broadly ovate, rarely rhombic-ovate, 4–5 × 3–4 cm, abaxially sparsely pubescent on veins, base cuneate, rarely truncate or rounded, margin sometimes slightly lobed, apex rounded, obtuse, or acute. Panicle dense, 5–25 cm; bracts and bracteoles glabrous. Flowers ca. 4 mm in diam.; pedicel ca. 3 mm or absent. Hypanthium abaxially glabrous. Sepals spreading or reflexed in fruit. Male flowers with filaments longer than petals. Follicles parallel. Fl. Jun, fr. Aug–Sep.

Grassy slopes on mountain summits; 3000--4000 m. E Xizang, NW Yunnan.