紫鞘西风芹 zi qiao xi feng qin

Plant 25–50 cm, monocarpic, glabrous throughout. Caudex simple. Stem solitary, suberect, solid, little-branched above, branches short and usually arcuate. Basal leaves many, petiole sheaths narrow, dark purple scarious-margined; blade ovate, 6–10 × 3–5 cm, 2-pinnate; pinnae shortly petiolulate; ultimate segments linear or linear-elliptic, 4–10 × 1.5–5 mm, entire or 2–3-lobed, abaxially glaucescent, margins narrowly revolute, apex apiculate. Uppermost leaves subsessile, with dilated, scarious-margined and dark purple sheaths; ultimate segments like basal. Synflorescence dichotomously branched, corymbose; umbels few, loose compound, 2.5–5 cm across; bracts and bracteoles absent; rays 3–5, 1.5–3 cm, subequal; umbellules 4–8-flowered; pedicels 2–4 mm. Calyx teeth obsolete or minute. Petals white, glabrous. Stylopodium conic; styles short. Fruit pale yellow, oblong, cross section rounded-pentagonal, 3.5–5 × 2–3 mm, glabrous; ribs prominent; ribs equal, shortly keeled; vittae 2–3 in each furrow, 4 on commissure. Fl. and fr. Jul–Sep.

Sunny mountain slopes; ca. 3800 m. E Xizang (Biru).