IOWA ACADEMY OF SCIENCES. 199 



Uhamnace^. 

 Ceanothus americaniislAnn. New Jersey Tea. Red-Root. 



Quite common on the prairies and edge of the timber. 

 Rhamnus lanceolata Pursh. Buckthorn. 



Common among cherry and plum thickets. 



VlTACE^. 



Vitus rlparia Michx. 

 The wild grape is very common along our streams and 

 ravines. It may be found along every old fence or 

 hedge row. 

 Ampelopsis quinqiiefoUa Michx. Virginia Creeper. 

 Common, Dry woods and fences. 



Sapindace^. 

 jEscuIus (/labia Willd. Ohio Buckeye. 

 Very common on the river bottoms. 

 Acer dasijcarpum Ehrh. Soft Maple. 



Very common along the river banks. This tree com- 

 poses ninety per 'cent of our artificial groves. 

 Acer saccharinum. Sugar or Hard Maple. Rock Maple. 

 Common, found principally in groves on the river bot- 

 toms. 

 Negundo aceroides Moench. Box Elder. Ashleaved Maple. 

 Very common along the rivers and tributaries, grow- 

 ing in rich, alluvial soil. 

 Anacardiace^e. 



Rhus glabra Linn. Common Sumac. Smooth Sumac. 



Very common everywhere. 

 Rhus toxicodendron Linn. Poison Ivy. Poison Oak. 

 Very common in timber and along fences and hedge 

 rows. 

 Leguminos^. 



Gledifschia triacanthos Linn. Honey-Locust. 



Not common. 

 Robinia pseud-acacia Linn. Black Locust. 



Found only v^here planted, or escaped from cultiva- 

 tion. 

 Gijmnocladus canadensis Lam. Kentucky Coffee Tree. 

 Frequent in rich soil of river bottoms. 



