PhytoKeys 2018 17(96):87-97. Epub 2018 Apr 17.
Department of Biology, Wayne E. Manning Herbarium, Bucknell University, 1 Dent Drive, Lewisburg, PA USA.
The genus is recognized as one of the most diverse endemic radiations of Saxifragaceae in North America, yet species delimitation and geographic distribution within the group remain controversial. Many species remain difficult to identify, including , a narrow Appalachian endemic and globally imperiled (G2) taxon recorded only from West Virginia and Virginia that occurs in sympatry with and . A recent survey of the cliffside flora of the Shikellamy Bluffs, PA recorded dozens of individuals that, through the use of social media, were positively identified as . Read More