168 



Zima aiirea (L.) Koch. Winnebago area, in the black oak for- 

 est ; Hanover area, in the mixed forest. 



Cornaccae 



Cornus Baileyi Coult. & Evans. Hanover, Winnebago, Amboy, 

 Havana, and Oquawka areas, in the bur oak and mixed forest asso- 

 ciations ; also in the dune thickets and the blowout thickets. 



Ericaceae 



Pyrola elliptica Nutt. In the bur oak association in the Winne- 

 bago area. 



Monotropa nniHora L. Winnebago area, in the black oak forest, 

 probably a pioneer from the bur oak association. 



Prhmilaceae 



Steironema lanceolatum (Walt.) Gray. Winnebago area, in the 

 swamp association. 



DodecatJieon Meadia L. Winnebago area, in the bur oak asso- 

 ciation. 



Oleaceae 



Fraxinus pennsylvanica Marsh., van lanceolata (Borkh.) Sarg. 

 Hanover and Oquawka areas, in the mixed forest and dune thicket 

 associations and as a pioneer in the black oak forest. 



Apocynaceae 



Apocynmn androsacinifolimn. L. Winnebago and Amboy areas, 

 in the black oak forest and persisting as a relic in the bur oak asso- 

 ciation ; Hanover area, in the mixed forest. 



Apocynmn cannahinmn L., var. hypericifoliimi (Ait.) Gray. In 

 blowsand in the Dixon area. 



Asclepiadaceae 



Asclepias tuherosa L. Hanover, Havana, and Amboy areas, in 

 the black oak forest ; Oquawka area, in the mixed forest ; Winne- 

 bago area, along a sandy roadside. 



Asclepias syriaca L. Hanover and Oquawka areas, near culti- 

 vated grounds around the river dune; Havana area, in the black 

 oak and Solida<io associations. 



