Morphometrics and Phylogenomics Reveal a New Species of Heuchera (Saxifragaceae) in Northeastern México

Abstract Here I describe a new species, Heuchera folkii, narrowly endemic to high altitude limestone outcrops of the Sierra Madre Oriental, Coahuila, Mexico, together with a phylogenomic and morphometric evaluation of the Heuchera species of northeastern Mexico. Originally thought to be a disjunct population of Heuchera sanguinea, the new species is phylogenetically and morphologically most similar to Heuchera lakelae, from which it is distinguished based on morphometric characters and other morphological attributes, phylogenetic placement, geographic range, phenology, and ecological preferences.