沼生橐吾 zhao sheng tuo wu

Senecio lamarum Diels, Repert. Spec. Nov. Regni Veg. Beih. 12: 508. 1922; Ligularia angustiligulata C. C. Chang.

Stem erect, 37-52 cm tall, slender, 2-4 mm in diam. at base, proximally glabrous, distally and synflorescence shortly pilose. Basal leaves petiolate; petiole 8.5-29 cm, slender, glabrous, base sheathed; leaf blade triangular-sagittate or ovate-cordate, 3-9 × 2.2-12.5 cm, glabrous, palmately veined, margin dentate and ciliate, apex acute; sinus 1/4-1/3 as long as leaf blade, broad; basal lobes triangular, apex obtuse or acute. Middle to distal stem leaves shortly petiolate; sheath enlarged, amplexicaul; leaf blade smaller, cordate or ovate-cordate. Synflorescence racemose, 10-16 cm, clustered, spicate or lax; leaflike bracts linear, to 1.7 cm; peduncles 3-4(-8) mm, slender, shortly brown pilose. Capitula numerous; supplementary bracts subulate. Involucre campanulate-turbinate, 6-9 × 3-5 mm, outside glabrous; phyllaries 6-8, in 2 rows, oblong, apex acute; inner phyllaries membranous at margin. Ray florets 5-8, yellow; lamina oblong, 7-10 mm, ca. 1.5 mm wide, apex obtuse; tube 3-4 mm. Tubular florets numerous, 5-7 mm; tube 2-3 mm; limb broadly campanulate, ca. 2 mm wide. Achenes brown, cylindric, 4-5 mm. Pappus yellowish, slightly shorter than tubular corolla. Fl. Jul-Aug, fr. Aug-Sep.

Swamps, wet grasslands, scrub, forest understories; 3300-5300 m. SW Gansu, W Sichuan, SE Xizang, NW Yunnan [NE Myanmar].