Abstract
Clematismae Z.Z.Yang & L.Xie, a new species of Ranunculaceae from Xinjiang, China, is described and illustrated. The new species is morphologically similar to C.orientalis and C.glauca but can be distinguished for being a less hairy plant (hairy in C.orientalis), often 2-ternate leaves (1–2-pinnate for C.orientalis and C.glauca), lanceolate to linear-lanceolate leaflets (elliptic or ovate in C.glauca), larger flowers (smaller flower in C.orientalis) and narrowly lanceolate sepals with acute to slightly attenuate apex (narrowly oblong sepals in C.orientalis and ovate to broadly lanceolate sepals in C.glauca). The new species is endemic to the southern slope of North Tianshan Mountain in Central Xinjiang. The conservation status of the species is also discussed.
Highlights
Meclatis (Spach) Baillon known as the Orientalis group is one of the taxonomically most difficult groups in the genus, with approximately a dozen yellow-flowered species that are widely distributed in Eurasia (Grey-Wilson 1989, Brandenburg 2000, Wang 2006)
The new species is most similar to C. orientalis L. and C. glauca Willd. and it can be distinguished from the latter two species by the following combinations of characteristics
Plants of the new species are less hairy than C. orientalis and, in this respect, are similar to C. glauca
Summary
Meclatis species are widely distributed and present a wide range of morphologic variation (e.g. C_orientalis L., C. glauca Willd., C. tibetana Kuntze and C. tangutica (Maxim.) Korsh.). A new local species belonging to C. sect. Meclatis in Xinjiang and adjacent areas, we confirmed that this plant represents a distinctive taxonomic entity and describe it as a new species. The new species is most similar to C. orientalis L. and C. glauca Willd.
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