大叶独活 da ye du huo

Platytaenia olgae (Regel & Schmalhausen) Korovin; Tetrataenium olgae (Regel & Schmalhausen) Mandenova.

Plants stout, 80–200 cm high. Caudex thickened, woody, covered with residual fibers of sheaths. Stem solitary, ± densely hispid, branching from middle. Lower leaves trifoliolate; leaflets ovate or broadly ovate, adaxially finely scabrous-hairy, abaxially sparsely or densely hairy to white tomentose, margin serrate. Upper leaves reduced, small, scarcely divided, blade sessile on expanded sheaths. Umbels numerous, 6–11 cm wide; bracts absent; rays 10–40(or more), unequal, 2–5 cm, densely hispid; bracteoles 5–7, linear, nearly as long as umbellule; umbellules 20–25-flowered. Calyx teeth triangular. Petals yellowish, abaxially hairy, outer flowers in umbel slightly radiant. Fruit obovoid or suborbicular, 8–12 × 7–9 mm, scarious hairy only along ribs; dorsal and intermediate ribs ridged, lateral ribs broadly winged, wings narrower than body of mericarp; vittae solitary in each furrow, filiform, extending 3/4 length of mericarp, 2 on commissure, ca. 1/4 the length of mericarp. Fl. and fr. Jul–Sep.

Stony talus slopes; ca. 2000 m. Xinjiang [Afghanistan, Kazakhstan, Kyrgyzstan, Pakistan, Tajikistan, Uzbekistan].