Koford 186 Cynomys ludovicianus July 17 1955. Devil's Tower Wyoming ant mounds (Dan O'dain thru). || In 6x6' plot: Ab Plentago puncti 20%, Lygodiun 20%, Aristida 20%, Dyspholia 10%, Hed- sema 5%, Sphaerulae 5%, Ammochlea 20%, Ambrosia (A) 10% Apppepper 17%, 4 zone (<1%) Ag. sm., Bromus, Origma, Lappula, alliniae alba, & at least 3 other falas. || On Both shrub plantogs cut. || On mounds noted: A plants marked on separate list. || In census plot #1, thick Bromus at SW end, then Aristida; center + NE mostly Bucklee, patchy Aristida, scattered Hedlema, Sphaerulae. || On a hillslope, about 20%, Lygodiunia 16" tall cut to 20' upslope from nearest burnure. || At E. side, no spread on terrace near river. Some Melilotin (tall) cut there, & Symphoricarpus orientalis. || On E. part tour on main terrace, toward river, now mainly Aristida, with Hedlema, Dyspholia, Achillea pinnula, occurs, small (6'cross) golden Bucklee. (Don Harvey believes Aristida favored where water penetration better, Bucklee on slightly heavier soil). at 5E edge of main ter- ace, when 15' drops to river bank area, four burnures within 20 yds. edge. Bromus & Stipa comata near edge. In 5E part calary, Ammochlea?, Dyspholia, now dry + dead. || No further extension burnures to SW beyond fence, apparently because of very thick growth of Bromus tectorum there, Theroophyllum cut (gr.) at same site near mounds. || Counted all burnure in census plot #1, about 2 1/4 A, not counting those < 6' from counted. With few exceptions, all appear to be seed & deep. Total 225, or about 100/A. This where population maximal for long time. Along a ditch at SW end plot, 1 1/2' deep, 3 burnures on 5' wide ditch bank within 8 yds. distance. Ag. sm., Arist. larg. growing at top bank. Illustrates that a break in vegetation on slope + trail.