Olfelt, J.P. and G.R. Furnier. 1995. Genetic distinctness and variability of Sedum integrifolium ssp. leedyi. Final report to the Natural Heritage and Nongame Research Program, Minnesota Department of Natural Resources. Unpaged.
Leedy's roseroot (Sedum integrifolium ssp. leedyi) is on the Minnesota endangered, and federally threatened species lists. The federal status depends on Clausen's (1975) description of the taxon as distinct, however, his sample sizes are small, and his description is open to question. We have sampled plants from Minnesota, New York, and western S. integrifolium populations, and analyzed them using random amplified polymorphic DNA (RAPD) markers as well as morphological markers. We report progress in techniques we plan to use for a common garden experiment as well as preliminary analyses of genetic distances and variation within and among S. integrifolium taxa. These analyses suggest that there are significant differences between Leedy's roseroot and the other subspecies of S. integrifolium, and they show little genetic variation in Leedy's roseroot. The variation and genetic distances within S. integrifolium are compared with genetic distances and variation within and among S. rosea, S. rhodanthum, and S. integrifolium. These parameters are important for decisions of whether and how to protect Leedy's roseroot populations.