. Bulletin. Natural history; Natural history. August, 1955 EvERs: Hill Prairies of Illinois 403 thapsus, Achillea millefolium, and Setaria â viridis. On the last visit it was found that the prairie had been burned a week before, fig. 17. From the tenant farmer it was learned that this prairie is burned in early spring each year to allow an ear- Mud Creek.âIn the years of this study, prairie occupied much of the sandy loess ridge that separates the bottomland of the Illinois River from Mud Creek in the northeast quarter of section 1, T. 16 N., R. 11 W., Morgan County. A thicket. Fig. 17.âSurfac
. Bulletin. Natural history; Natural history. August, 1955 EvERs: Hill Prairies of Illinois 403 thapsus, Achillea millefolium, and Setaria â viridis. On the last visit it was found that the prairie had been burned a week before, fig. 17. From the tenant farmer it was learned that this prairie is burned in early spring each year to allow an ear- Mud Creek.âIn the years of this study, prairie occupied much of the sandy loess ridge that separates the bottomland of the Illinois River from Mud Creek in the northeast quarter of section 1, T. 16 N., R. 11 W., Morgan County. A thicket. Fig. 17.âSurface of Reavis Spring hill prairie after an early spring fire. The size of the clumps of Andropogon scoparius is evident by comparison with the 1-foot rule. Her and more tender growth of grass than would normally occur. Bluff Springs.âDisturbed prairie, which covered about a half acre on the north part of a loess mound in the south- west quarter of section 21, T. 18 N., R. 11 W., mile north of Bluff Springs, Cass Countv, was visited September 15, 1949; July 6, 1950; and May 18, 1951. The mound and the adjacent lower slopes were pastured. The lower slope on the west was occupied by a mesophytic dis- turbed prairie with Poa pratensis locally dominant. The steeper slopes of the mound were prairie, with Andropogon scoparius the dominant grass. Bouteloua curtipendula and several plants of Spiran- thes cernua occurred on these slopes. The almost level top, which had been much disturbed by trampling, supported a mix- ture of prairie and weeds. bordered the road on the lower north- west-facing slope. This thicket extended into the coves and partly up the cove slopes. Prairie covered the spurs and ridge-top, fig. 18. The dominant grass was Andropogon scoparius. Bouteloua curtipendula and B. hirsuta grew in scat- tered clumps in the prairie, Psoralea ten- uiflora was common, and Sisyrinchium campestre very abundant. All of this prai- rie and that part of the ridge that was covered w
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