Description from Flora of China
Hymenidium nubigenum (H. Wolff) Pimenov & Kljuykov.
Plants dwarf, to 15 cm, near rosette. Root stout, 0.5–1 cm across. Stem greatly reduced, rarely branched. Petioles 2–4 cm, sheaths oblong, membranous; blades oblong, 4–6 cm, 2-ternate-pinnate; pinnae 4–5 pairs, only the basal petiolulate, ca. 1 cm; ultimate segments linear or linear-lanceolate, ca. 5 × 1–2 mm. Primary umbels 10–15 cm across; peduncle very short; bracts several, small, leaf-like; rays 6–15, 5–10 cm, stout, somewhat unequal, ribbed, thickening especially at distal parts; umbellules borne above leaves; bracteoles 10–15, obovate to oblong, 5–10 × 3–4 mm, margin broad, white, membranous, apex acute; pedicels numerous, 3–5 mm, flattened and winged. Calyx teeth triangular-lanceolate, ca. 0.5 mm. Petals white, spatulate, ca. 1.5 mm, apex obtuse. Fruit ellipsoid, dark gray-green, 3–4 mm; ribs crisped-winged; vittae 3 in each furrow, 5–6 on commissure. Fl. and fr. Jul–Aug.
This rather poorly known taxon is recorded only from a few collections.
Alpine grasslands; ca. 4900 m. W Sichuan, E Xizang, NW Yunnan.