161 



Rhamnaceae 



Ceanothus americanus L. Hanover, Winnebago, Amboy, 

 Oquawka, and Hanover areas, in the black oak, bur oak, and mixed 

 forest associations; occasional in the bunch-grass in the Oquawka 

 area. 



Ceanothus ovatits Desf. Hanover area, in the bunch-grass, de- 

 posit, and black oak associations. 



Vitaceae 



Psedera qiiinqiief olia (L.) Greene. Winnebag'o area, in the bur 

 oak association ; Hanover, Havana, and Oquawka areas, in the mixed 

 forest, blowout thicket, and dune thicket associations, and one of the 

 most frequent pioneers in the black oak association. 



Vitis vulpina L. Winnebago and Amboy areas, in the bur oak 

 association; Havana, Oquawka, and Hanover areas, in the mixed 

 forest, the blowout thickets, and the dune thickets, and occasional as 

 a pioneer in the black oak association. 



Malvaceae 



Callirhoe triangulata (Leavenw.) Gray. Hanover and Havana 

 areas, chiefly in the bunch-grass and the black oak forests, and occa- 

 sionally in the Panlcum pseudopuhcscens association. 



Hypcricaceae 



Hypericum cistifolium Lam. Oquawka area, in the mixed for- 

 est association along the river dune. 



Hypericum miitilum L. Havana area, in the Solidago asso- 

 ciation. 



Hypericum majus (Gray) Britton. In the Polytrichum asso- 

 ciation in the Dixon area. 



Hypericum gentianoides (L.) BSP. Dixon area, in the Poly- 

 trichum association, or perhaps more common in a zone just outside 

 of it. 



Cistaceae 



Helianthemum uiajus BSP. Hanover, Winnebago, Amboy, 

 Dixon, Havana, and Oquawka areas, probably most widely distributed 

 in the black oak association, but also abundant in the bunch-grass. 



Hudsonia tomentosa Nutt. Hanover and Dixon areas, charac- 



