细梗丝瓣芹 xi geng si ban qin

Plants 18–40 cm. Root tuberous, ovoid, 5–7 mm across. Stem ribbed, slightly branched. Basal leaves petiolate, petioles 7–13 cm, sheaths small; blade triangular, 4–5.5 × 5–6 cm, 1–2-ternate-pinnate; pinnae broad-triangular, 2–4 × 1.5–3.5 cm, 3-lobed or entire, petiolules 1–1.8 cm; ultimate segments obovate, base cuneate, cuspidate-serrate distally, scabrous along nerves adaxially. Umbels 2.2–3.4 cm across; peduncles slender; bracts and bracteoles absent; rays 5–6, 1–1.5 cm, very unequal; umbellules 6–7 mm across, 4–7-flowered; pedicels 1.6–3.5 mm, slender, unequal. Calyx teeth obsolete. Petals purple-red, broad-ovate, 3–3.5 × ca. 1 mm; apex linear, 2–2.5 mm, glandular-pubescent. Mature fruit unknown. Fl. Jul.

Forested ravines; 3300–3800 m. Xizang.

This poorly known taxon is recorded only from a few collections.