SUB-CLASS II. DIC0TYLED0NE8. 179 



Order 7. Poly^onales. 

 Family Polygonacece. 



Rumex acetosella L. • Sheep Sorrel. Common in dry fields 

 and waste places. Calmar, Hesper. 



Rumex verticillatus L. Swamp Dock. In swamps. Re- 

 ported by Fitzpatrick. 



Iiumex altissimus Wood. Tall Dock. Common in low places. 

 Decorah (Savage), etc. 



Rumex patientia L. Patience Dock. Common in waste 

 places. Introduced. Calmar. 



Rumex brittanica L. Great Water-dock. Common in wet 

 places. Calmar, etc. 



Rumex crispus L. Curled Dock. Introduced. Decorah 

 (Arthur). 



Fagopyrum fagopyrum (L.) Karst. (F. esculentum Moench.) 

 Buckwheat. Not uncommonly naturalized in waste places. Ft. 

 Atkinson, etc. 



Polygonum amphibium L. Water Persicaria. Aquatic. Re- 

 ported by Fitzpatrick. 



Polygonum emersum (Michx.) Britt. (P. muhlenbergii S. 

 Wats.) Swamp Persicaria. Locally common in ponds. Ft. 

 Atkinson. 



Polygonum incarnatum Ell. (P. lapathif olium var. incar- 

 natum W T ats.) Pink Persicaria. Common in wet soils. De- 

 corah, Ft. Atkinson. 



Polygonum lapathif olium L. Pale Persicaria. Common in 

 waste places. Introduced. 



Polygonum pennsylvanicum L. Pennsylvania Smartweed. 

 Common in moist soil. Decorah, Hesper, Calmar. 



Polygonum persicaria L. Lady's Thumb. Introduced weed. 

 Calmar, etc. 



Polygonum hydropiper L. Smartweed. In moist grounds, 

 common. Ft. Atkinson, etc. 



Polygonum virginianum L. Virginia Knotweed. Rather com- 

 mon in woods. Decorah (Goddard), Canoe creek. 



Polygonum aviculare L. Doorweed. A common introduced 

 door-yard weed. Calmar, Hesper, etc. 



Polygonum camporum Meisn. Prairie Knotweed. In dry, 

 sandy soil. Near Hesper. 



