158 



dune thicket associations; Winnebago area, in the bur oak asso- 

 ciation ; in both areas as a pioneer in the black oak association. 

 Prunus sp. (Plum). Hanover area, in the dune thickets. 



Lcguininosac 



Gymnodadus dioica (L.) Koch. Havana area, in the mixed for- 

 est association. 



Gleditsia triacanthos L. Hanover area, in the dune thicket asso- 

 ciation ; Dixon area, planted on the deposits of a blowout ; Oquawka 

 area, along roadsides. 



Cassia Chamacchrista L. Most abundant in the Havana and 

 Ocjuawka areas, in the bunch-grass, blow sand, and black oak asso- 

 ciations; Hanover area, in the blowsand association; Amboy area, 

 in the black oak forest ; Dixon area, in the Solidago association. 



Cercis canadensis L. Oquawka area, in the mixed forest asso- 

 ciation. 



Bapfisia bractcaia (Aluhl.) Ell. Winnebago area, in the black 

 oak association ; Oquawka area, in the bunch-grass and Panicnm 

 pseudopuhcsccns associations. 



Lnpinus pcrcnnis L. Winnebago and Amboy areas, in the black 

 oak association ; Kankakee area, in mucky meadows at the base of 

 sand hills. 



TrifoUitin prafcnsc L. Oquawka area, roadsides. 



Trifoliuin repcns L. Oquawka area, along roadsides. 



Amorpha cancsccns Pursh. Hanover, Winnebago, Amboy, Dixon, 

 Kankakee, Oquaw^ka, and Havana areas, most abundant in and typi- 

 cal of the bunch-grass association, persistent as a relic and common 

 in the black oak association, and occasional in the bur oak and mixed 

 forest associations; in the Hanover area, also on the perched dunes. 



Pcialostcmnni piirpurcum (Vent.) Rydb. Hanover and Oquawka 

 areas, abundant in the bunch-grass ; also in the black oak association 

 in the Amboy and Oquawka areas; along roadsides in the Winne- 

 bago area. 



Petalosfeiiiuni candid uni Michx. Hanover and Oquawka areas, 

 in the bunch-grass association ; Winnebago and Amboy areas, in the 

 black oak association. 



Tcphrosia lirginiana (L.) Pers. In all seven areas; abundant 

 in the bunch-grass and black oak associations, frequent on blowout 

 deposits, and occasional in the blowsand and Panicuni pseudo- 

 puhcsccns associations. 



Rohinia Pseudo-Acacia L. Oquawka area, commonly planted as 



