Species of several genera in this family of succulent plants are grown especially in rock gardens, and some, such as Sempervivum tectorum L., hen-and-chickens, have been collected rarely where garden refuse is dumped or other places where “transplanted,” (Barry and Benzie Cos.) but it is hardly established. It has leaves flat and numerous in a basal rosette. See Mort et al. (2001) for generic relationships in the family.
1. Leaves entire, flat or terete to elliptic in cross-section; flowers white or yellow.
1. Leaves irregularly toothed, flat; flowers white to (usually) pink or purple.
2. Leaves mostly alternate, with smooth glabrous margins.
2. Leaves all opposite, with prominent papillose-ciliate margins.
All species found in Crassulaceae
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. October 19, 2017. http://michiganflora.net/family.aspx?id=CRASSULACEAE.