We follow O’Kane & Al-Shehbaz (1997) in placing Arabis lyrata into Arabidopsis; indeed, our two species look similar and are sometimes confused. See Koch et al. (2008) for more information.
1. Petals (4–) 5–8 (–9) mm long, seeds ca. 1 mm long.
1. Petals 2–4.2 mm long, seeds ca. 0.3–0.5 mm.
All species found in Arabidopsis
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 12, 2017. http://www.michiganflora.net/genus.aspx?id=Arabidopsis.