Figure 1. Left: county map of Alabama and portions of some nearby states; Bibb County, Alabama shaded in gray, with general location of Ketona Dolomite Glades marked with a white asterisk; horizontal hatching = known county distribution of Erigeron strigosus var. calcicola; vertical hatching = county distribution of Silphium perplexum. Right: guide to boundaries of states (dotted lines) and physiographic regions demarcated at left. Base map derived from Physical Map of the Southeast, copyright 1967 by Wilbur H. Duncan.