An associational study of Illinois sand prairie . 54 present study, but it v/ould seem that the mere reoocnition of such agrouping is a suggestive step tov/ard the formulation of the criteriaof dominance and an orderly and analytical knowledf;e of the constitu-tion of the THE PANICUM PSEUDOPUBESCENS ASSOCIATION?The dominating factor In the Panicum pseudopubescene associa-tion is the wind, which has gained control over the plants, and isnow destroying the vegetation. This association is merely thetransition stage in the succession from bunch-grass to blow-sand,and is marked by a l
An associational study of Illinois sand prairie . 54 present study, but it v/ould seem that the mere reoocnition of such agrouping is a suggestive step tov/ard the formulation of the criteriaof dominance and an orderly and analytical knowledf;e of the constitu-tion of the THE PANICUM PSEUDOPUBESCENS ASSOCIATION?The dominating factor In the Panicum pseudopubescene associa-tion is the wind, which has gained control over the plants, and isnow destroying the vegetation. This association is merely thetransition stage in the succession from bunch-grass to blow-sand,and is marked by a large proportional area of bare sand,which isconstantly being removed by wind. The association is very common-ly found on dune summits, where wind exposure is pronounced. Panicum pseudopubescens is the last bunch-grass species to bekilled by the removal of sand from its roots. It seems to thrivebetter under conditions of sand removal than in more stable sand,in competition with the other bunch-grasses. It thus becomes thedominant plant of the association. A few other bunch-forming spe-cies persist in this association as relics from the bunch grass;some of these are Panicum perlongum. AndropoKon sooparius. Koeleriaoristata, and Cyperus schwelnitzii. The secondary species areper
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