Ostericum viridiflorum (Tarcz.) Kitag.

The young plants are eaten as a spring vegetable.

Plants 0.5–1 m. Root conic, yellowish brown, branched. Stem purplish green, acute-angled, pubescent. Petioles ca. 10 cm, acute-triangular, sheaths triangular-ovate; leaf blade triangular-ovate, 10–15 × 15–20 cm, 2-pinnate, pinnae long-petiolulate; leaflets subsessile, ovate or oblong, 4–7(–10) × 2–4(–6) cm, base truncate or obliquely broad-cuneate, margin white-cuspidate-serrate, apex acuminate, scabrous along nerves abaxially. Central umbels 4–9 across, peduncle very short, lateral umbels opposite or cyclic, peduncles longer, scabrous; bracts 2–3, lanceolate, ca. 1 cm; rays 10–18, 1–2 cm, unequal, hispidulous; bracteoles 3–9, linear-lanceolate; umbellules 10–20-flowered; pedicels hispidulous. Calyx teeth ovate. Petals green or greenish white, ovate. Fruit ellipsoid-orbicular, 4–6 × 2.5–4 mm; dorsal ribs acute-prominent, lateral ribs broad-winged; vittae 1 in each furrow, 2 on commissure. Fl. Jul–Aug, fr. Aug–Sep. n = 11*.

Heilongjiang, Jilin, Liaoning [Russia (Siberia)].

Damp meadows, riversides, stream banks; 800–1100 m.