An associational study of Illinois sand prairie . they have no part in the binding ofthe sand. They are absolutely dependent upon the bunch-grasses. Thecommonest of the interstitials are: Oenothera rhombipetala Nutt.,Ambrosia psilostachya DC, Linaria canadensis (Linn.) Dumont, Cassiachamaechrista Linn., Monarda punctata Linn., and Groton glandulosusLinn., var. septentrionalis Muell. Arg. The animals of the bunch-grass association may be classified inthe same v;ay as the plants: the and local distributionof the animals are very similar to those of the plants, though per-haps not s
An associational study of Illinois sand prairie . they have no part in the binding ofthe sand. They are absolutely dependent upon the bunch-grasses. Thecommonest of the interstitials are: Oenothera rhombipetala Nutt.,Ambrosia psilostachya DC, Linaria canadensis (Linn.) Dumont, Cassiachamaechrista Linn., Monarda punctata Linn., and Groton glandulosusLinn., var. septentrionalis Muell. Arg. The animals of the bunch-grass association may be classified inthe same v;ay as the plants: the and local distributionof the animals are very similar to those of the plants, though per-haps not so readily recognized. Most of the plant-eating animals,which in the sand-prairie are mostly insects, and the sedentary andphytophilous « predaceous species, are found on the bunch-grasses andmat plants, which will be remembered as the dominant growth animals do not occur in the clumps of grasses, but are found » Phytophilous species are those v/hich live upon, or normally restupon, plants, as for instance crab-spiders or plant 43 on the bare sand spaces betv^een. These animals are for the greaterpart predacGous forms: all are geophilous and represent more the ?fauna of the bare sand than that of prairie grov/th. We thus have thetypical prairie forms or grass species, and the interstitial formsor sand species. The distinction is fundamental, because for animals there is no important enviromiental difference betweenthe interstitial patches of bare sand and the large bare areas whichconform to our concept of the blowsand association. Each sandy spacebetween tufts of bunch-grass is a small blowsand association, andnumbers of blowsand animals are attracted to it. The whole bunch-grass area is thus a composite association, composed of a number ofsmall prairies and a number of small blov/sand associations. This distinction must lie kept in mind as we study the bunch-grass associationwhich is composed of tv/o elements - prairie species, sand species
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