IOWA "ACADEMY OF SCIENCES. 161 



P. lapathifolium incarnation Watson. Appanoose Co. Wet 

 soil, frequent. 



P. hydropiper L. Decatur and Johnson Cos. Wet soil, fre- 

 quent. 



P. hydropiperoides Mx. Johnson Co. Wet soil, frequent. 



P. hartwrightu Gray. Henry Co. 



P. virginianum L. Decatur and Johnson Cos. Low woods, 

 frequent. 



P. aviculare L. Decatur, Appanoose, and Johnson Cos. 

 Waste places, common. 



P. erectum L. Decatur Co. Waste places, common. 



P. ramosissimum Mx. Decatur, Des Moines, and Johnson 

 Cos. Sandy soil, common, 



P. sagittatum L. Johnson Co. Wet soil, common. 



P. convolvulus L. Shelby and Johnson Cos. Fields and 

 waste places, common. 



P. dumetorium scandens Gray. Decatur Co. 



P. cuspidatum Sieb & Jucc. Johnson Co. Rarely an escape 

 into waste places. 



Fagopyrum esculentum Moench. Decatur, Appanoose, Des 

 Moines, Shelby, and Johnson Cos. Fields and waste places, 

 infrequent. 



ARISTOLOCHIACE^E. 



Asarum canadense D. Decatur, Appanoose, Des Moines, and 

 Johnson Cos. Wooded river bluffs, frequent. 



THYMELiEACEiE. 



Dirca palustris L. Johnson Co. Open woods, frequent 

 locally. 



SANTALIACE^E. 



Commandra umbellata Nutt. Decatur, Des Moines, and John- 

 son Cos. Sandy soil in woods, frequent. 



EUPHORBIACE^E. 



Euphorbia maculata L. Decatur, Wapello, and Johnson Cos. 

 Waste places, common. 



E. preslii Guss. Decatur, Van Buren, and Johnson Cos. 

 Waste places, frequent. 



