浅齿橐吾 qian chi tuo wu

Senecio potaninii C. Winkler, Trudy Imp. S.-Peterburgsk. Bot. Sada 13: 5. 1893; Cacalia potaninii (C. Winkler) Mattfeld; Senecillis potaninii (C. Winkler) Kitamura.

Stems 1 or 2, erect, to 31 cm tall, ca. 3 mm in diam. at base, proximally glabrous, distally and branches of synflorescence shortly brown pilose. Basal leaves petiolate; petiole often purplish red, to 11 cm, glabrous, base narrowly sheathed; leaf blade abaxially purplish red, broadly reniform, 4.5-6 × 9-10.5 cm, subleathery, abaxially hairy only along veins, reticulate veins prominent and white, adaxially glabrous, palmately veined, base shallowly cordate, margin undulate-crenate and ciliate, apex rounded or retuse; sinus ca. 1/4 as long as leaf blade, broad. Middle stem leaves smaller, reniform; petiole enlarged into a sheath; sheath 2.5-5 cm, to 2.5 cm wide. Distalmost stem leaves with only enlarged sheath or very rarely lanceolate, without sheath. Capitula (3-)7-9 in corymb; leaflike and supplementary bracts linear; peduncles 1-2 cm. Involucre turbinate, 1-1.1 cm, mouth ca. 1 cm in diam., outside glabrous; phyllaries 9 or 10, in 2 rows, oblong or lanceolate, purple ciliate, apex acute or acuminate; inner phyllaries membranous at margin. Florets 20-30, yellow, all tubular, 9-10 mm; tube ca. 5 mm. Achenes brown, cylindric, 5-7 mm. Pappus white, as long as tubular corolla. Fl. Jul.

● Grassy areas in swamps; ca. 4000 m. SW Gansu, N Sichuan.