159 



a sand-binder and escaping into the mixed forest and blowout thicket 

 associations. 



Desmodmni grandiHormn (Walt.) DC. Winnebago area, in the 

 bur oak association. 



Desniodimn illinoense Gray. Oquawka area, in the bunch-grass 

 association ; Amboy area, in the black oak forest. 



Lcspede::a capitata Alichx. Common in all seven areas, chiefly 

 in the bunch-grass and black oak associations ; a relic in the Pani- 

 cuni pseudopuhescens association, active in the stabilization of all 

 parts of the blowouts; in the Dixon area it appears in the Solidago 

 association ; and in the Hanover area, on the perched dunes. 



Strophostylcs helvola (L.) Britton. Havana area, in the black 

 oak forest; Oquawka area, in the bunch-grass, blowsand, black oak, 

 and mixed forest associations. 



Strophostylcs sp. Havana area, in the bunch-grass association. 



'Aniphicarpa Pitcheri T. & G. Hanover area, in the mixed for- 

 est association ; W^innebago area, in the bur oak association. 



Linaccae 



Linmn snlcatuni Riddell. Hanover and Ocjuawka areas, in the 

 bunch-grass association. 



OxaHdaceae 



Oxalis cornicnlata L. Hanover area, in the bunch-grass and 

 black oak associations. 



Gcraniaceae 



Geranium maculatiim L. Winnebago area, in the bur oak as- 

 sociation. 



Rutaceae 



Zanthoxyluni americamim Mill. Oquawka area, in the mixed 

 forest association. 



Polygalaceae 



Polygala polygaina Walt. Hanover, Winnebago, Dixon, and 

 Oquawka areas, in the bunch-grass, Paiiicitm pscudopidicscens, and 

 black oak associations. 



Polygala incarnata L. Oquawka area, in the bunch-grass asso- 

 ciation. 



Polygala sanguinca L. Dixon area, in the Solidago association, 



