二色棱子芹 er se leng zi qin

Pleurospermum govanianum (de Candolle) Bentham ex C. B. Clarke var. bicolor Franchet, Bull. Soc. Philom. Paris, sér. 8, 6: 137. 1894, not P. govanianum var. bicolor H. Wolff (1929); Hymenidium bicolor (Franchet) Pimenov & Kljuykov.

Plants 10–40 cm. Root long-conic, simple. Stem purple-green, often simple, ribbed. Basal and lower petioles 2–8 cm, sheaths narrowly oblong, membranous; blades oblong, 4–10 × 2–6 cm, 1-pinnate to 2-pinnatifid; pinnae 4–5 pairs, only basal pinnae shortly petiolulate; ultimate segments oblong, 1.2–2.5 cm, serrate to pinnatifid. Stem leaves gradually reduced upwards. Umbels terminal, 5–9 cm across; bracts 3–8, narrowly oblanceolate, 1.5–2.5 cm; rays 2–4, 1.5–3.5 cm, unequal; bracteoles 6–8, broadly ovate, 7–12 × 6–8 mm, median stripe broad, purple-green, margin broad white-membranous, apex 1–3-lobed, slightly exceeding flowers; pedicels ca. 2 mm. Calyx teeth narrowly triangular, ca. 1 mm. Petals white, purple-red distally, apex rounded. Anthers dark purple. Stylopodium dark purple. Fruit narrowly obovoid, 2.5–3 × 1.8–2 mm; ribs sinuolate winged; vittae 2 in each furrow, 4 on commissure. Fl. Aug–Sep, fr. Sep–Oct.

Open mixed woodlands, dwarf Rhododendron scrub, alpine pastures; 3500–4300 m. SW Sichuan, SE Xizang, NW Yunnan.

This species is similar to, and sometimes confused with, the Himalayan unispecific genus Pleurospermopsis.