Pimpinella thellungiana H. Wolff var. tenuisecta Y. C. Chu.

Plants perennial, 20–40 cm, sparsely pubescent. Root cylindrical, 7–10 × ca. 1 cm. Stem little-branched. Basal and lower petioles 5–20 cm; blade 2-pinnate; primary pinnae 5–6 pairs; secondary pinnae broad linear, 5–15 × 1–2 mm, sparsely pubescent. Upper leaves reduced, 1-pinnate or 3-lobed, lobes linear. Umbels 3–5 cm across; bracts and bracteoles absent; rays 15–25, 2–4 cm; umbellules 5–10 mm across, 15–20-flowered; pedicels 2–4 mm. Calyx teeth obsolete. Petals white, obovate, base shortly clawed, apex with small incurved lobule. Stylopodium conic; styles ca. 3 × stylopodium. Fruit oblong-ovoid, ca. 3 × 2.5 mm, base cordate, glabrous; vittae 3 in each furrow, 4 on commissure. Seed face plane. Fl. Jun–Jul, fr. Aug–Sep.

Grassy slopes. Hebei, Heilongjiang, Jilin.