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Mazus sunhangii , a new species of Mazaceae from central China is described and illustrated based on evidence from morphology and molecular phylogeny. This new species is morphologically similar to  M .  puchellus  and  M .  omeiensis  but differs in erect habit, inflorescence position, leaf pattern and corolla color. Phylogenetic analysis based on four chloroplast DNA regions ( rbcL ,  rps16 ,  trnL-F , and  psbA-trnH ) identified the new species as the independent lineage sister to the other East Asian  Mazus  species. The new species is known only from a single location in Mt. Shennongjia area in northwest Hubei province, at the elevation of 760 m. The species grows on the limestone cliff, and, because a tourist arterial highway is located along this cliff, its habitat can be easily disturbed or destroyed. We propose that the only known species location is recognized as critical habitat (i.e., as the habitat required to ensure the persistence of a species) and the species listed as Critically Endangered based on the International Union for Conservation of Nature Red List Categories and Criteria B2a.

Mazus sunhangii (Mazaceae), a New Species Discovered in Central China Appears to Be Highly Endangered