20. Pleurospermum benthamii (Wallich ex de Candolle) C. B. Clarke in J. D. Hooker, Fl. Brit. India. 2: 703. 1879.
宝兴棱子芹 bao xing leng zi qin
Hymenolaena benthamii Wallich ex de Candolle, Prodr. 4: 246. 1830; Hymenidium benthamii (Wallich ex de Candolle) Pimenov & Kljuykov; H. davidii (Franchet) Pimenov & Kljuykov; Pleurospermum davidii Franchet.
Plants (25–)45–150 cm. Root cylindric, ca. 2.2 cm thick, annular ringed at apex. Stem hollow, thinly ribbed, base ca. 2 cm thick, often tinged purple. Basal and lower petioles 10–18 cm, sheaths narrow-oblong; blades broadly triangular-ovate, 8–15 cm, 2–3-ternate-pinnate, glabrous; pinnae 3–4 pairs, short-petiolulate; ultimate segments narrow-ovate or lanceolate, 1–2.5 × 0.3–1 cm, base decurrent, serrate-pinnatifid. Umbels (5–)10–15 cm across; peduncle 4–12 cm; bracts 5–9, oblanceolate, 3–9 × 1–2 cm, margin white-scarious, apex pinnate; rays 10–25, 5–10 cm (in fruit), scabrous-ribbed; bracteoles 6–9, oblanceolate, 8–20 × 3–5 mm, margin white-scarious, apex 3-lobed, pedicels 15–20, 5–15 mm (to 35 mm in fruit), flattened, scabrous. Calyx teeth obsolete. Petals obovate, white, rarely pink, 2–3 mm, acute. Stylopodium conic. Fruit ovoid-ellipsoid, 6–10 × 2.5–4.5 mm; ribs all sinuolate-winged; vittae 1 in each furrow, 2 on commissure. Fl. Jun–Jul, fr. Aug–Sep.
Open scrub, alpine pastures, riversides; 2200–4300 m. W Sichuan, SE Xizang, NW Yunnan [Bhutan, N Myanmar, E Nepal, Sikkim].
This species has reputed medicinal value (in Yunnan).