Figure 3. Scatterplot of the first two multidimensional scales for 653 switchgrass plants representing six geographical areas defined by a combination of ecoregions (Bailey, 1998) and USDA hardiness zones (Cathey, 1990): PPT = Prairie Parkland (Temperate) ecoregion; LMF = Laurentian Mixed Forest ecoregion; EBFC = Eastern Broadleaf Forest (Continental) ecoregion; and EBFO = Eastern Broadleaf Forest (Oceanic) ecoregion. Numbers refer to USDA hardiness zones.