148 



of the river dunes; rare in open places in the black oak association, 

 or as a relic in other situations. 



Panicwn pcrlongum Nash. Hanover, Havana, and Winnebago 

 areas, common in the bunch-grass and Panicimi pseudopubescens 

 associations, or in open places in the black oak association. 



Panicuin Scrihncriannui Nash. Only in the most mesophytic sta- 

 tions of the bunch-grass association in the Havana, Hanover, Dixon, 

 and Oquawka areas ; along roadsides and at the edge of the black 

 oak forest in the Amboy and Winnebago areas. 



Setaria glauca (L. ) Beauv. Naturalized from Europe. Hanover 

 area, a weed in pastured bunch-grass. 



Cenchrus carolinianus Walt. Hanover, Dixon, Havana, and 

 Oquaw^ka areas; regularly in the blowsand association or as an in- 

 terstitial on blowout deposits. 



Stipa spartea Trin. In the bunch-grass association in the Han- 

 over, Dixon, Havana, and Oquawka areas, more rarely on deposits 

 or at the edge of black oak woods; also in a pastured field in the 

 Winnebago area. 



Aristida hasiramea Engelm. Oquawka area, according to Patter- 

 son. 



Aristida tubercidosa Nutt. Hanover, Dixon, Havana, and 

 Oquawka areas, common as an interstitial in the bunch-grass and 

 Panicuin pseudopubescens associations, very abundant and charac- 

 teristic in the blowsand association, common at the edge of the black 

 oak forest, and in the Dixon area abundant in the SoUdago asso,- 

 ciation. 



Sporobolns cryptandrus (Torr.) Gray. Chiefly in the blowsand 

 and deposit associations of the Hanover, Havana, and Oquawka 

 areas, sometimes in bare sunny spots in the black oak forest. 



Sporobohis hetcrolepis Gray. Oquawka area, according to Pat- 

 terson. 



CalaniovUfa loiigi folia (Hook.) Hack. Dixon, Havana, and 

 Oquawka areas, in the bunch-grass association or persisting as a relic 

 in open places in the black oak association. 



Koclcria crista fa (L.) Pers. Hanover, Winnebago, Dixon, and 

 Oquawka areas, abundant and conspicuous in the bunch-grass ; per- 

 sisting as a relic in the black oak and Panicum pseudopubescens 

 associations ; and in rare cases appearing on blowout deposits. 



Spartina Michauxiana Hitchc. Amboy area, along roadsides, 

 doubtless adventive from the swampy meadows below. 



Boutelona hirsnta Lag. Hanover, Havana, and Oquawka areas, 

 common but inconspicuous in the bunch-grass, where it grows as an 



