Angelica tenuissima Nakai, Bot. Mag. (Tokyo) 33: 10. 1919.

Plants 60–100 cm. Root branched, caudex short. Stem erect, purplish, hollow, branching. Basal leaves withered at flowering, lower petioles up to 20 cm; blade ternate-3–4-pinnate; ultimate segments linear, 5–30 × 1–3 mm. Umbels terminal and lateral, terminal umbels 3–5 cm across; bracts 1–2, linear, 1–2 cm, white membranous margined, usually caducous; rays 10–18, slightly unequal, 2–5 cm; bracteoles 5–8, lanceolate, 8–15 mm, shorter than umbellules, white membranous margined; pedicels unequal, 5–10 mm. Calyx teeth obsolete. Petals white, obovate, base cuneate. Stylopodium short conic; styles reflexed. Fruit oblong, ca. 4 × 2–2.5 mm; dorsal and intermediate ribs prominent, lateral ribs narrowly winged; vittae 1 in each furrow, 2 on commissure. Seed face plane. Fl. Aug–Sep, fr. Sep–Oct.

This species is used in NE China (especially Liaoning) as a regional substitute, known as “han gao ben” (or “huo gao ben” or “shan gao ben”), for the traditional Chinese medicine “gao ben” (see Ligusticum sinense and L. jeholense).

Forests, rocky slopes; 1000–2000 m. Hebei, Liaoning [Korea].