Fig. 2. Exponential regression of population and location mean frequency of (A) stable sparse-flowering plants (SSFP) or (B) stable nonflowering plants (SNFP) on mean temperature of the coldest month during the experimental period of May 1998 to July 2000. The ranking of locations for mean temperature of the coldest month, from lowest to highest, was Ashland, Arlington, Charlottetown, Ithaca, and Corvallis.