Description from Flora of China
Hymenidium yunnanense (Franchet) Pimenov & Kljuykov; Pleurospermum pseudoyunnanense H. Wolff.
Plants 30–60(–100) cm. Taproot stout, dark brown. Stem hollow, distally ribbed and branched. Basal and lower petioles up to 20 cm; sheaths broad oblong, extended to first pinnae in mid and upper leaves, puberulous along veins; blades broadly triangular-ovate, 10–20 cm, 2–3-ternate/pinnate, glabrous; ultimate segments ovate or oblong, 1–2.8 × 0.5–2 cm, acutely serrate to lacerate. Umbels 7–10(–15) cm across; peduncles 7–12 cm; bracts 6–8, oblong to broadly lanceolate, 2–4 × 1–2 cm, divided at apex; rays 12–25, 3–5 cm, brown-hirtellous along ribs; bracteoles 6–10, oblong-obovate, 10–15 mm, membranous except midribs, cuneate, 3–5-lobed to pinnatifid at apex; pedicels numerous, 6–8 mm in fruit. Calyx teeth conspicuous, lanceolate-triangular, ca. 0.5 mm. Petals obovate, greenish-white, occasionally flushed pink. Anthers dark purple-black. Fruit broad-ovoid, 3–4 × 2.5–3.2 mm; ribs narrowly winged; vittae 2 in each furrow, 4 on commissure. Fl. Jun–Sep, fr. Aug–Oct.
Woodland margins, dwarf Rhododendron scrub, valley sides, rocky slopes; 3600–4100 m. W Sichuan, NW Yunnan [NE Myanmar].