A well-known family of the Western Hemisphere, but poorly represented in our area. Like most of the family, our two species are leafless, with fleshy green stems bearing spines. The strong spines arise from areoles containing numerous short barbed bristles, which are more irritating than the spines themselves.
Key to the species of Opuntia.
All species found in Cactaceae
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 24, 2017. http://michiganflora.net/family.aspx?id=cactaceae.