IOWA ACADEMY OF SCIENCES. 207 



ANACARDIACE^. 



Rhus glabra L. Smooth sumach. Common in thickets along 

 the bluffs, or on the upland. 



Rhus toxicodendron L. Poison ivy. Rich soil. 



LEGUMINOS^. 



Rdbinia pseudacacia L. Common, or black locust. Not com- 

 mon. 



Gymnocladus canadensis Lam. Kentucky coffee tree. Rare. 

 Gleditschia triacanthos L. Honey locust. Quite frequent. 



ROSACEA. 



Prunus americana Marshall. Wild plum. Very common in 

 clumps on rich soil. It also grows on upland among the hazel. 



Prunus serotina Ehrh. Wild black cherry. Quite common. 



Prunus virginiana L. Choke cherry. Common in thickets 

 on low land. 



Rubus strigosus Michx. Wild red raspberry. 



Rubus occidentalis L. Black raspberry. 



Rubus villosus Ait. Common blackberry. 



Rosa blanda Ait. Wild rose. Common. 



Pyrus coronaria L. Crab apple. Common on low ground. 



Crataegus coccinea L. Hawthorn. Red haw. 



Crataegus coccinea var. mollis Torr. and Gray. The two 

 species above are quite common on the bottoms and along 

 ravines. 



Amelanchier canadensis Torr. and Gray. Service berry. June- 

 berry. Common along banks of ravines. 



SAXIFRAGACE^. 



Ribes oxyacanthoides L. Common wild gooseberry. 



HAMAMELID^. 



Hamamelis virginiana L. Witchhazel. Very common. Pound 

 on upland growing among the hazel thickets. 



CORNACE^. 



Cornus stolonifera Michx. Red osier dogwood. 

 Cornus paniculata L'Her. Panicled cornel. Common dog- 

 wood. Common. 



CAPRIFOLIACE^. 



Sambucus canadensis L. Blackberried elder. Common on 

 rich soil. 



