侧茎橐吾 ce jing tuo wu

Senecio pleurocaulis Franchet, J. Bot. (Morot) 8: 365. 1894, based on S. tatsienensis Franchet, Bull. Soc. Bot. France 39: 293. 1893, not Bureau & Franchet (1891); Cremanthodium pleurocaule (Franchet) R. D. Good; C. pleurocaule f. franchetii R. D. Good.

Plants grayish green. Stem erect, 25-100 cm tall, 4-10 mm in diam. at base, proximally glabrous, distally and synflorescence white arachnoid-puberulent. Basal leaves subsessile; sheath often purplish red; leaf blade linear-oblong or broadly elliptic, 8-30 × 0.7-7 cm, glabrous, pinnate-parallel or parallel veined, base narrowed, margin entire, apex acute. Stem leaves sessile, smaller, elliptic to linear, base semiamplexicaul or not. Synflorescence racemose, to 20 cm, often lax; leaflike bracts lanceolate to linear, to 8 cm, sometimes longer than peduncle; peduncles 0.5-3(-10.5) cm. Capitula numerous, inclined to one side of racemose axis; supplementary bracts linear-subulate. Involucre turbinate, 5-14 × 5-15(-20) mm, outside glabrous, base acute; phyllaries 7-9, in 2 rows, ovate or lanceolate, 2-7 mm wide, apex acute; inner phyllaries membranous at margin. Ray florets yellow; lamina broadly elliptic or ovate-oblong, 7-14 × 3-6 mm, apex acute; tube ca. 2 mm. Tubular florets numerous, 5-6 mm; tube ca. 1 mm. Achenes brown, cuneate-cylindric, 2.5-3.5 mm, ribbed. Pappus white, as long as tubular corolla. Fl. and fr. Jul-Nov.

● Slopes, stream banks, scrub, alpine meadows; 3000-4700 m. SW and W Sichuan, Xizang, NW Yunnan.