Micranthes, a segregate of Saxifraga, includes those species with a leafless flowering stem (at most tiny bracts), and (in our species) herbaceous-textured leaves. See Soltis et al. (2001) for more discussion.
1. Larger leaves (10–) 14–35 cm long, obscurely crenulate-toothed to remotely denticulate, entire around the apex; petals (2–) 2.5–3 (–3.5) mm long; plants of swampy habitats.
1. Larger leaves 3–7.5 cm long or even shorter, distinctly toothed, especially around the apex; petals (3–) 3.5–5 (–5.5) mm long; plants of rocky, mostly dry habitats.
All species found in Micranthes
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. October 19, 2017. http://michiganflora.net/genus.aspx?id=Micranthes.