Description from Flora of China
Hymenidium wrightianum (H. de Boissieu) Pimenov & Kljuykov; Pleurospermum prattii H. Wolff.
Plants (15–)30–60 cm, tuberculate. Root brown, 1–2 cm thick. Stem tinged purple-red, ribbed and branched. Basal and proximal petioles 5–8 cm, flattened, winged, sheaths narrow, oblong; blades narrowly oblong-ovate, 4–9 × 2.5–5 cm, 2–3-ternate-pinnate; pinnae 5–7 pairs, proximal pinnae petiolulate; ultimate segments linear-lanceolate, 3–5 × 0.5–1 mm, acute. Umbels 15–20 cm across; peduncle 2–3 cm; bracts 7–9, linear-lanceolate, 2–3 cm, apex pinnatifid, deciduous; rays 10–20, 3–10 cm (10–13 cm in fruit), very unequal; bracteoles ca. 10, oblanceolate, 7–15 × 3–7 mm, apex pinnate; pedicels 10–15, 5–12 mm. Calyx teeth minute, triangular. Petals obovate, white or purplish-reddish. Stylopodium short-conic. Fruit narrowly elliptic-ovoid, 5–6 × 2.5–3.2 mm, usually tuberculate; ribs all broadly cristate-winged; vittae 1 in each furrow, 2 on commissure. Fl. Jul–Aug, fr. Sep–Oct.
Alpine grasslands; 3600–4600 m. SE Qinghai, SW Sichuan, SE Xizang, NW Yunnan