白序橐吾 bai xu tuo wu

Stem erect, to 90 cm tall, to 1.2 cm in diam. at base, proximally glabrescent, distally and synflorescence densely white arachnoid-puberulent. Basal leaves petiolate; petiole to 36 cm, white arachnoid-puberulent, base narrowly sheathed, not winged or distally narrowly winged; wing margin dentate; leaf blade reniform, 13-14 × 17.5-20 cm, abaxially sparsely arachnoid-puberulent along veins, adaxially glabrous, palmately veined, with 9 principal veins, abaxially conspicuously prominent, margin minutely sharply dentate, apex rounded or obtuse; sinus ca. 1/3 as long as leaf blade, broad; basal lobes suborbicular, outer margin coarsely dentate. Middle to distal stem leaves similar but smaller, shortly winged petiolate; wing margin dentate; sheath enlarged, 3-5 cm, margin entire or dentate. Synflorescence racemose, 15-20 cm, distally clustered, proximally lax; leaflike bracts spatulate, proximal ones to 6 cm, smaller distally, submembranous, shortly petiolate, margin dentate, apex acuminate; peduncles: proximal ones to 6 cm, smaller distally, slender. Capitula numerous; supplementary bracts narrowly lanceolate, as long as or slightly longer than involucre. Involucre broadly campanulate, 1-1.5 × 1.5-2 cm, outside shortly pilose; phyllaries 10-14, in 2 rows, oblong, 3-4 mm wide, apex broadly triangular; inner phyllaries broadly brown membranous at margin. Ray florets 5 or 6, yellow; lamina linear, 1.5-2 cm × ca. 2 mm, apex obtuse; tube 6-7 mm. Tubular florets numerous, 1-1.2 cm, extending from involucre; tube 6-7 mm. Pappus yellow, as long as tubular corolla. Fl. Aug.

● Grassy slopes; 3400-3500 m. NW Yunnan.