Figure 2. Scatterplot of the first two multidimensional scales for 165 plants representing 11 switchgrasscultivars, grouped by a combination of ecoregions (Bailey, 1998) and USDA hardiness zones (Cathey, 1990): PPT = Prairie Parkland (Temperate) ecoregion; EBFC = Eastern Broadleaf Forest (Continental) ecoregion; and EBFO = Eastern Broadleaf Forest (Oceanic) ecoregion. Numbers refer to USDA hardiness zones.