Sinosenecio minshanicus (Asteraceae, Senecioneae), a new species from south-eastern Gansu and northern Sichuan, China

Sinosenecio minshanicus (Asteraceae, Senecioneae), a new species from south-eastern Gansu (Wenxian and Zhugqu counties) and northern Sichuan (Pingwu county), China, is described and illustrated. This species is similar to S. rotundifolius, a species locally endemic to Songpan county in northern Sichuan, in having a scapigerous habit, orbicular leaves and solitary capitula, but differs by the presence (vs. absence) of stolons and by having thinner rhizomes (ca. 2 mm vs. more than 5 mm in diameter), stems proximally sparsely fulvous arachnoid or glabrescent (vs. densely sericeous-villous) and obscure (vs. conspicuous) main veins on adaxial surface of leaves. The chromosome number of the new species is reported to be 2n = 60. Colour photographs of living plants in the wild and a distribution map are provided for the new spe-cies and S. rotundifolius. The geographical distribution of S. rotundifolius is also corrected, with the previ-ous record of this species from south-eastern Gansu (Wenxian county) actually referring to S. minshanicus.

Automated summary

Sinosenecio minshanicus, a new species of Asteraceae, Senecioneae, is discovered in south-eastern Gansu and northern Sichuan, China. It is similar to S. rotundifolius in appearance, but differs in the presence of stolons, thinner rhizomes, sparsely fulvous arachnoid or glabrescent stems, and inconspicuous main veins on adaxial surface of leaves. The chromosome number of the new species is reported to be 2n = 60. The article provides color photographs and a distribution map of the new species, as well as correcting the geographical distribution of S. rotundifolius.