181 



eral stems in a cluster ascendin,ii- from a coin inon center, and 

 while of little importance in holdinji' the sand they frequently 

 collect considerable quantities altont their bases. 



No attempts liave been made toward controlling the move- 

 ment of the sand and rendering it available for agricultural 

 purposes, but much could be accomplished in that direction. 

 Hedges have been planted in some places, and thickets of plum- 

 trees have been allowed to grow between cultivated fields and 

 sand-hills. The Lombardy poplar (PI. XX., Fig.l) might I)e used 

 with good results, as it thrives on the sand and spreads rapidly 

 by its long underground roots. 



List of the Plants Observed.* 

 polypodiacej,. 

 Pteridiuiii aquiliiutin (L.) Kuhu. 



Equisetace.e. 

 Equisctum aroe)ise L. 

 Equlsetum rohustum A. Br. 



Gramine.e. 

 Andropoyon scoparius Michx. 

 Andropogon furcatns Miihl. 

 So i'</ ha strum ai:euaceum (Michx. ) Nash. 

 Paspalum setaceum, Michx. 

 Syntherisma fill form is ( L. ) Nasli. 

 Panicum cognaUim Schultes. 

 Panicum rirgati'm L. 

 Panicum sp.f 



Cha'iochloa viridis (L. ) Scribn. 

 Cenchrus trihuloides L. 



* Only thofie species" of speriiiato]ihytes and pteridnphytes which grow on the 

 sand prairies or in the black-jack forest proper, without a covering of leaf-mold, have 

 been included in this list. Some additional species have been reported by ratterson 

 ('76) and McDonald ('00). The nomenclature followed is essentially that of Britton's 

 Manual. 



t Abundant on the bunch-grass prairies and of sparing occurrence in the black- 

 jack; conspicuous and well marked liy the dense tufts with the crowded, almost fas- 

 tigiate, asceniling leaves. The primary panicle fruits in .luly, and the sjiikelets have 

 nearly all fallen off when the secondary panicles appear, in the middle of August. 

 The S|ieeitic identity of the plant is in d(jubt. 



