Abstract
Sinosenecio jiuzhaigouensis (Asteraceae, Senecioneae), a new species from Jiuzhaigou county in northwestern Sichuan province, China, is described and illustrated. This species is similar to S. hederifolius and S. cyclaminifolius in having ovate-cordate leaf blade and solitary capitula, but differs by having swollen (vs. not swollen) rhizomes and smaller capitula (2–3 vs. 4–5 cm in diameter). Two floral micromorphological characters (configuration of filament collars and of anther endothecial cell wall thickenings), achene surface feature, and chromosome number of the new species are reported.
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