An associational study of Illinois sand prairie . e, with large, compact, flat-topped tufts; Stipa spartea Trin.,tall, loose, few-leaved; Panicum pseudopubescens Nash, with short,broad leaves, forming very flat bunches, often eighteen inches indiameter; Bouteloua hirsuta Lag., very depressed, grayish bunches,which are often subordinated by othergrasses; one, possibly two,other species of Bouteloua; Gyperus schweinitzii Torr., a sedge form-ing sparse, open bunches; Andropogon scoparius Michx., and Andropogonfurcatus Muhl., forming very large bunches. The bunch-grasses permit the growth of the s
An associational study of Illinois sand prairie . e, with large, compact, flat-topped tufts; Stipa spartea Trin.,tall, loose, few-leaved; Panicum pseudopubescens Nash, with short,broad leaves, forming very flat bunches, often eighteen inches indiameter; Bouteloua hirsuta Lag., very depressed, grayish bunches,which are often subordinated by othergrasses; one, possibly two,other species of Bouteloua; Gyperus schweinitzii Torr., a sedge form-ing sparse, open bunches; Andropogon scoparius Michx., and Andropogonfurcatus Muhl., forming very large bunches. The bunch-grasses permit the growth of the secondary plants onlyin the small areas of bare sand betv/een the bunches. These secondaryplants form three ecological groups, which may be called perennials,mats, and interstitials. The rerennials are deep-rooted, most of them growing inbuncheislike those of the grasses. These are usually able to with-stand the encroachment of the grasses, but cannot displace them. Thetypical perennials are Aster linariifolius Linn., Lithospermum gmeHnj. ^0
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Keywords: ., bookcentury1900, bookdecade1910, bookidassocia, booksubjecttheses
