1. Plant a stiffly erect little taprooted annual, a common weed in disturbed ground; sepals persistent; seed 2 per locule.
1. Plant a matted to erect perennial woody at base, rarely escaped from gardens; sepals quickly deciduous; seeds 1 per locule.
All species found in Alyssum
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 10, 2017. http://www.michiganflora.net/genus.aspx?id=Alyssum.