Microtoena wawushanensis (Lamiaceae, Lamioideae): A new species from Sichuan, China

<i>Microtoenawawushanensis</i>, a new species from Sichuan, China, is described and illustrated here. The new species is closely related to <i>M.moupinensis</i> and <i>M.prainiana</i>, but differs distinctly from both in leaf, calyx and bract morphology. It is further distinguished by its highly variable and unstable calyx tooth ratio (1.36-2.13), red-marked lateral lobes on the lower corolla and filaments that are barbate at both the upper and basal parts, with nearly imperceptible hairs in the middle section. Phylogenetic analyses, based on 81 coding regions of the chloroplast genome, suggest that <i>M.wawushanensis</i> belongs to sect. Delavayana and is sister to a clade formed by <i>M.urticifolia</i>, <i>M.prainiana</i> and <i>M.megacalyx</i>.