2 12 DAVENPORT ACADEMY OF SCIENCES. 



Acer, Tourn. 



142. A. saccharinum, Wang. 

 Hilly woods; infrequent. 



143. A. saccharinum, Wang., var. nigrum, Torr. & Gray. 

 Wild Cat Den; Le Claire; infrequent. 



144. A. dasycarpum, Ehrh. 



River banks and low grounds; common. 

 Negundo, Moench. 



145. N. aceroides, Moench. 

 Along streams ; frequent. 



Staphylea, L. 



146. S. trifolia, L. Bladder-nut. 

 Hilly woodlands ; not frequent. 



ANACARDIACEiE. 



Rhus, L. Sumach. 



147. R. glabra, L. 



Open woods and clearings ; common. 



148. R. Toxicodendron, L. Poison Oak. 

 River banks and woods; common. 



149. R. Canadensis, Marsh. 



Sand along Cedar and Wapsipinicon Rivers, and on Musca- 

 tine Island; frequent. 



POLYGALACEiE. 



Polygala, Tourn. Milkwort. 



1 50. P. Senega, L. Seneca Snake-root. 

 Dry soil; frequent 



151. P. incarnata, L. 



Dry sandy soil, Lake T'w'p., Muscatine county; scarce. 



152. P. sanguinca, L. 



Sandy and moist ground; common. 



153. P. cruciata, L. 



Mossy borders of a pond, Lake T'w'p., Muscatine county; 

 scarce. 



154. P. verticillata, L. 

 Dry hills; infrequent. 



