Sinosenecio tongziensis (Asteraceae), a new species from north Guizhou, China

<i>Sinoseneciotongziensis</i> R.B.Zhang, Tan Deng & Ying Liu (Asteraceae), a new species from Tongzi County in northern Guizhou, China, is described and illustrated. It closely resembles <i>S.changii</i> in the subscapigerous habit, ovate-oblong and pinnately veined leaf lamina, and simple to compound terminal corymbs, yet differs markedly by the texture of leaf lamina (membranous vs. papery), the number of lateral veins (8-10 vs. 10-18), and the indumentum on the stems, leaves, and inflorescences (pubescent with 2-5 mm long, uniseriate, spreading hairs vs. sparsely white arachnoid to densely white tomentose). Phylogenetic analysis indicates that <i>S.tongziensis</i> is related to <i>S.bodinieri</i>, <i>S.nanchuanicus</i>, <i>S.confervifer</i>, and S.globigervar.adenophyllus.