252 DAVENPORT ACADEMY OF SCIENCES. 



682. P. ramosissimum, Michx. 

 Sandy soil ; rather common. 



683. P. tenue, Mickx. 



Sandy soil, Cedar River, Muscatine Island. 



684. P. lapatlufolium, L., var. incarnation, Watson. 

 Wet grounds ; common. 



685. P. Pennsylvanicum, L. 



Moist waste grounds; common. 



686. P. aniphibium, L. 



In water and mud, ponds along the Mississippi, Cedar, and 

 Wapsie ; infrequent. 



687. P. Muhlenbergii, Watson. 



Low grounds ; common. A troublesome weed. 



688. P. Hartwrightii, Gray. 



Margins of ponds ; Eldridge, Noels, and islands of Missis- 

 sippi River. 



689. P. orientale, L. Prince's Feather. 



Escaped from Gardens ; frequent along river bank in Musca- 

 tine and ^Davenport. 



690. P. Persicaria, L. 

 Waste places ; common. 



691. P. Hydropiper, L. 



Wet grounds ; common. 



692. P. acre, HBK. 



Wet grounds ; common. 



693. P. Virginia?ium, L. 



Moist rich woodlands ; infrequent. 



694. P. sagittatum, L. Arrow-leaved Tear-thumb. 

 Low grounds ; rather frequent. 



695. P. Convolvulus, L. Black Bindweed. 

 Waste places ; frequent. 



696. P. dumetorwn, L., var. scandens, Gray. 

 Thickets ; frequent. 



697. P. cuspidatum, Sieb. & Zucc. 

 Escaped from gardens at Wilton. 



Fagopyrum, Tourn. 



698. F. esculentum, Moench. Buckwheat. 

 Spontaneous in fields and roadsides. 



