Summary of seed collection sites used in study.

Note.—MAT = mean annual temperature; MAP = mean annual precipitation; n (RI) = number of plants measured in Rhode Island garden; n (FL) = number of plants measured in Florida garden; climate data from stations with long-term records (>25 years; U.S. stations: U.S. National Climatic Data Center, http://www.ncdc.noaa.gov/oa/ncdc.html; Canadian station: Canadian Climate Data and Information Archive, http://www.climate.weatheroffice.ec.gc.ca/).