下延叶古当归 xia yan ye gu dang gui

Angelica officinalis Moench var. decurrens (Ledebour) Avé-Lallemant; Angelica archangelica var. decurrens (Ledebour) Weinert.

Plants 1–2 m. Root brown, cylindric, stout. Stem 2–6 cm thick, thinly ribbed. Basal leaves to 100 cm (including petiole). Cauline leaves petiolate, petioles 8–17 cm, sheaths saccate-inflated, to 6 cm wide, glabrous; blade broadly triangular-ovate, 11–15(–20) × 11–17 cm, 2–3-pinnate; leaflets subsessile, oblong to ovate-lanceolate, base cuneate, margin irregularly toothed, glabrous, terminal leaflets often 3-lobed, decurrent along petiolules. Umbels subglobose, 7–15 cm across; bracts 4–7, lanceolate, pubescent; rays 20–50, 2.5–5 cm, subequal, hispidulous; bracteoles 5–10, linear-lanceolate, margin ciliate, shorter than or equaling pedicels; umbellules 30–50-flowered. Petals broad-ovate. Fruit 5–10 × 3–5 mm; ribs all thick-winged, lateral ribs narrower than the body; vittae numerous, small, encircling the seed. Fl. Jul–Aug, fr. Aug–Sep.

Forests, shrubby thickets, ravines, river banks, damp areas; 500–1500 m. Nei Mongol, Xinjiang [Kazakhstan, Kyrgyzstan, Mongolia, Russia (Siberia); C and E Asia].

This species has reputed medicinal value in Nei Mongol.