Minuartia

1. Petals clearly longer than the sepals; seeds 0.7–0.8 mm wide.

M. michauxii

1. Petals shorter than to equaling the sepals; seeds ca. 0.6–0.7 mm wide.

M. dawsonensis

All species found in Minuartia

Minuartia dawsonensisROCK SANDWORT 
Minuartia michauxiiROCK SANDWORT 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 24, 2017. http://michiganflora.net/genus.aspx?id=Minuartia.