Description from Flora of China
Hymenidium cristatum (H. de Boissieu) Pimenov & Kljuykov.
Plants 60–120 cm, glabrous. Root gray-brown, conic. Stem slender, hollow, simple or branched. Basal and lower leaves long-petiolate, sheaths ovate; blades broadly triangular-ovate, 15–28 × 10–14 cm, 2-ternate-pinnate; ultimate segments rhomboid-ovate, 1.5–6 × 0.8–2.8 cm, cuneate, irregular-incised or pinnate, acuminate. Leaves reduced upwards. Umbels 3–5 cm across; bracts 3–7, obovate-oblong, 1–2.5 cm, apex entire; rays 7–13, 1–2.5 cm, subequal; bracteoles 4–6, linear-lanceolate, 1–2.3 cm, almost as long as rays; pedicels 15–25, 3–5 mm. Calyx teeth obsolete. Petals ovate, white, ca. 1 mm. Stylopodium conic. Fruit ovoid, brownish, 3.5–5 × 3–4.5 mm, tuberculate; ribs all broadly cristate-keeled/narrowly winged; vittae 1 in each furrow, 2 on commissure. Fl. and fr. Jul–Sep.
Forest margins, grasslands near ditches; 1000–2600 m. Anhui, Gansu, Henan, Hubei, Ningxia, Qinghai, Shaanxi, Shanxi, Sichuan.