Ostericum citriodorum (Hance) Shan Renhwa & C. Q. Yuan

The roots are used in traditional Chinese medicine as an analgesic and antipyretic.

Plants 0.5–1.3 m, glabrous. Root short-conic, brown, crown surrounded by fibrous remnant sheaths. Stem 2–5 mm thick, branched above. Petioles 5–30 cm, sheaths triangular-ovate, 0.5–1.5 cm; blade oblong-ovate to broadly triangular-ovate, 15–22 × 13–20 cm, 2–3-ternate-pinnate; leaflets subsessile, oblong-lanceolate to lanceolate, 3–6.5 × 0.4–2.5 cm, margin inconspicuously serrulate, apex acute and mucronate. Peduncles 6–9 cm; bracts 6–8, lanceolate, ca. 4 mm, multi-striate; rays 5–12; bracteoles 5–8, linear, 2–3 mm, reflexed. Calyx teeth conspicuous, triangular-ovate. Petals white, obovate, apex inflexed. Fruit ellipsoid to broad-ovoid, 3–4 × 3–3.5 mm, yellowish brown; dorsal ribs prominent, lateral ribs broad-winged, wings wider than the body; vittae 1–3 in each furrow, 2 on commissure. Fl. Jun–Aug, fr. Aug–Oct. n = 11*.

Fujian, Guangdong, Guangxi, Hunan, Jiangxi, Zhejiang.

Forest margins, shrubby thickets, grasslands; 800–1200 m.