214 DAVENPORT ACADEMY OF SCIENCES. 



Petalostemon, Michx. Prairie Clover. 



1 68. P. violaceus, Michx. 



Dry prairies; rather common. 



169. P. candidus, Michx. 



Same habitat as that of the last species but less common. 



Tephrosia, Pers. 



1 70. T. Virginiana, Pers. Goat's Rue. Catgut. 

 Dry sterile soil ; infrequent. 



Robinia, L. 



1 7 1. R. Pseudacacia 1 L. Locust. 

 Roadsides; frequent. 



Astragalus, Tourn. 



172. A. Canadensis, L. 

 Prairies; common. 



173. A. distort us, Torr. iS: Cray. 



Sandy soil of Cedar River region and Muscatine Island ; not 

 frequent. 



Desmodium, Desv. Tick-Trefoil. 



174. D. nudiflorutn, DC. 



Wooded hillsides at Wild Cat Den; scarce. 



175. D. acuminatum, DC. 

 Rich woods; common. 



176. D. canescens, DC. 

 Damp grounds; frequent. 



177. D. canescens, var. villosissimum, Torr. & Gray. 

 Woodlands, Moscow. Near Follets along the Wapsipinicon 



River. 



178. D. cuspidatum, Torr. & Gray. 

 Riclr woods ;_infrequent. 



179. D.\ lllinoense, Gray . 



Prairies and dry sandy soil; infrequent. 

 1 80. D. paniculatum, DC. 



Borders of woods ; frequent. 

 181. D. Canadense, DC. 



Borders of woods ; common. 



