Trachydium viridiflorum Franchet, Bull. Soc. Philom. Paris, sér. 8, 6: 111. 1894; Chamaesium markgrafianum (Fedde ex H. Wolff) C. Norman; Trachydium affine W. Smith; T. markgrafianum Fedde ex H. Wolff.

Plants (3–)8–20(–32) cm. Rhizome slender, torulose. Basal and lower petioles 1.5–6 cm, sheaths narrowly oblong; blade oblong, 1.5–3.5 × 0.8–2.5 cm; pinnae 2–4 pairs, remote; ultimate segments ovate, broadly ovate or ovate-oblong, 4–12 × 2–6 mm, apex 3-toothed, rarely entire; terminal pinnae broadly obovate to fan-shaped, 3–5-lobed. Leaves reduced upwards, uppermost with linear-elliptic ultimate segments. Umbels 1–5 cm across; peduncles slender, 1.5–8 cm; bracts 2–5, linear, entire or pinnatifid, leaf-like; rays 6–11, slender, 0.5–3.5 cm, unequal, spreading; bracteoles absent or 1–2, abortive (squamulate or occasionally linear). Calyx teeth minute, orbicular, ca. 0.3 mm, obscured by spreading stylopodium. Petals obovate, ca. 1 × 0.8 mm, greenish, apex obtuse. Fruit oblong-ellipsoid, 1.3–1.8 × 1–1.3 mm; ribs prominent. Fl. Jul–Aug, fr. Aug–Sep.

Forests, scrubland slopes, damp moorland; 3200–4300 m. Sichuan, Xizang, NW Yunnan [Sikkim].