PLANTS OF IOWA 169 



2179. B. divaricatum, (Schrank) Wimm. Circinate White 



Water Crowfoot. 

 Rare. 



OXYGRAPHIS. 



2180. 0. cymhalaria, (Pursh.) Prantl. Seaside Crowfoot. 

 On sandy shores, not common. 



Thalictrum, L. 



2181. T. dioicum, L. Early Meadow-rue. 

 Common on wooded slopes. 



2182. T. purpurascens, L. Purplish Meadow-rue. 

 Common in open places. 



2183. T. polygamum, Muhl. Tall Meadow-rue. 

 Not common. 



BERBERIDACE^. BARBERRY FAMILY. 



Berberis, L. 



2184. B. vidgaris, L. Common Barberry. 

 Introduced from Europe. 



Caulophyllum, Michx. 



2185. C. thalictroides, (L.) Michx. Blue Cohosh. 

 Rather common, in deep woods. 



Podophyllum, L. 



2186. P. peltatum, L. May Apple. 

 In deep woods, common. 



MENISPERMACE^. MOONSEED FAMILY. 



Menispermum, L. 



2187. M. canadense, L. Moodseed. 

 Quite common in woods. 



LAURACE^I. LAUREL FAMILY. 



Sassafras, Nees. & Eberm. 

 2187a. 8. sassafras, (L.) Karst. Sassafras. 

 Not common. 



PAPAVERACE^B. POPPY FAMILY. 



Agermone, L. 



2188. A. mexicana, L. Mexican Poppy. 

 Escaped from gardens. 



