716 WEED FLORA OF IOWA 



Polygonaceae. 



Rumex crispus, Curled dock. 



R. altissimus, Pale dock. 



R. sanguineus, Bloody dock. 



R. acetosella, Sheep sorrel. 



Polygonum aviculare, Knotweed. 



P. erectum, Larger knotweed. 



P. lapathifolium, Slender smartweed. 



P. Muhlenbergii, Marsh smartweed. 



P. pennsylvanicum, Pennsylvania smartweed. 



P. acre, Water smartweed. 



P. persicaria, Lady's thumb. 



P. convolvulus, Black bindweed. 



Chenopodiaceae. 



Chenopodium Botrys, Jerusalem oak. 



C. album, Goosefoot. 



C. hybridum, Maple-leaved goosefoot. 



Atriplex patula, Orach. 



Cycloma atriplicifolium, "Winged pigweed. 



Kochia scoparia, Mexican fireweed. 



Salsola kali var. tenuipolia, Russian thistle. 



Amaranthaceae. 



Amaranthus retroflexus, Green pigweed. 



A. graecizans, Tumble weed. 



A. blitoides, Prostrate pigweed. 



Acnida tuberculata v. prostrata, Water hemp 



Nyctaginaceae. 

 Oxybaphus nyctagineus, Wild four-o 'clock. 



Caryophyllaceae. 



Stellaria media, Chick weed. 



Cerastium nutans, Mouse-ear chickweed. 



Agrostemma githago, corn cockle (wheat section*! 



Lychnis alba, White campion. 



L. dioica, Red campion. 



Silene latifolia, Bladder campion. 



S. noctiflora, Night-flowering catchfly. 



S. antirrhina, Sleepy catchfly. 



