194 IOWA ACADEMY OP SCIENCES. 



P. aristata Mx. Ringgold, Montgomery, and Pottawattamie 

 counties. Wayside and waste places; frequent. 



Nyctaginace^. 



Oxyhaphus nyctagineus Sweet. Union county. Waste places; 

 frequent. 



0. hirsutus Sweet. Taylor county. Waysides; infrequent. 



0. angustifolius Sweet. Page, Taylor, and Fremont counties. 

 Prairies; infrequent. 



0. albidus Choisy. Union county. Waysides; infrequent; 

 the same as AlUonia albida Walt. 



Illecebrace^. 



Any cilia capilalcea DC. Ringgold, Page, Fremont, and Pot- 

 tawattamie counties. Woods; frequent. 



Amarantace^. 



Amarantus retroflexus L. Page and Fremont counties. 

 Waste places; common. 



A. albus L. Page county. Waste places. 



A. blitoides Watson. Fremont county. Waste places. 



Chenopodiace^. 



Chenopodium hybridum L. Ringgold and Fremont counties. 

 Waste places; frequent. 



Cycloloi iia platyjjhyUum Moq. Fremont county. Sandy soil; 

 frequent. 



Atriplex patulum hastatum Gray. Taylor county. Waste 

 places; infrequent. 



POLYGONACE^. 



Bumex crisjnis L. Clarke county. Waste places; frequent. 



It. acetosella L. Pottawattamie county. Waste places; fre- 

 quent. 



Polygonum virginianum L. Ringgold and Page counties. 

 Rich woods; common. 



P. aviculare L. Ringgold, Fremont, and Pottawattamie 

 counties. Waste places; common. 



P. erectum L. Clarke and Union counties. Waste places; 

 common. 



P. convolvulus L. Decatur county. Waste places; fre- 

 quent. 



P. muJilenbergii Watson. Ringgold and Fremont counties. 

 Wet places; frequent. 



