28 



THE PLANT SOCIETIES OF 



troides (Cohosh), Viola cucullata, Galiutn Aparine. Other character- 

 istic herbs are tlie nettles (Urtica gracilis, Laportea Canadensis), various 

 umbellifers (Heracleum, Cr3'ptotaenia, Saniciila, Osmorrhiza), and the 

 parasitic dodder [Cuscuta Gronovii). Fig. 12 shows a characteristic 

 mesnphytic flood plain forest along the Desplaines river; underneath 



Fig. 13. — Flood plain forest along a smal|| stream at Lockport, showing a rather striking 

 collection of southern trees (see text). Coffee tree in the foreground. 



the elms and basswoods is seen a rich herbaceous flora, consisting 

 largely of Phlox, which the picture shows in full bloom. 



In some of the bottom lands there is a rather striking collection of 

 trees, whose chief range is mainly southward. Fig. ij shows a flood 

 plain tree group near Lockport, most of whose members are largely 

 southern, viz., the coffee tree {Gymnocladus Canadensis), seen in the 

 foreground; the pawpaw {Asimina triloba), the sycamore {^Platanus 

 occidentalism, and the hackberry (^Celtis occidentalis.) In other flood 



