Ligusticum delavayi Franch.

This species has reputed medicinal value.

Plants 30–80 cm, glabrous. Root cylindrical, up to 10 cm. Stem single or multicipital, little-branched above. Basal and lower petioles 6–25 cm; blade oblong-ovate or lanceolate, 5–15 × 2–10 cm, 2–3-pinnate, primary pinnae 6–8 pairs; ultimate segments setuliform, 1–5 × ca. 0.5 mm. Upper leaves reduced, sessile, 1–2-pinnate. Umbels terminal and lateral, 3–10 cm across; bracts 1–4, linear-lanceolate, 5–15 mm, with white membranous margins; rays (6–)10–14, subequal, 3–4 cm; bracteoles 8–10, lanceolate, 5–8 mm, narrowly membranous margined. Calyx teeth conspicuous, subulate, ca. 0.5 mm, unequal. Petals white, obovate, base cuneate. Fruit oblong-ovoid, ca. 4 × 3 mm; dorsal and intermediate ribs raised, lateral ribs narrowly winged; vittae 3 in each furrow, 6 on commissure. Seed face plane. Fl. Aug–Sep, fr. Sep–Oct. 2n = 22*.

S Xizang, NW Yunnan.

Montane thickets, alpine pastures; 2800–4500 m.