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(1. Polygonum.) 



amphibium, L. (Water Knotweed.) 



Borders of ditches; Cherry Island, Gordon's. Rare. 

 Not found in flower. Aug. 

 Pennsylvanicum, L. 



Moist grounds; Brandy wine. Frequent. July. 

 Persicaria, L. (Lady's Thumb.) 



Waste places, roadsides, &c. Common. Aug. 

 Hydropiper, L. (Smart-weed.) 



Wet grounds, race banks. Common. Aug. 

 acre, H. B. K. (Wild Smart-weed.) 



With the last, and very like it. Frequent. Aug. 

 hydropiperoides, Miclix. 



Wet places along rivulets. Frequent. Aug. 

 aviculare, L. (Knotgrass. G-oosegrass. Door-weed.) 



Yards and footpaths. Common. June, 

 aviculare, L., var. erectum, Roth. 



Shaded roadsides and waste places. Frequent. June, 

 aviculare, L., var. ?littorale, Link. 



Beaches; probably in Appoquinimink Hundred; 

 found in Kent Co. (Z?r. Michener.) 

 tenne, Michx. (Slender Knotgrass.) 



Dry rocky hills. Frequent. July. 

 Virginianum, L. 



Rich woods, &c. Frequent. July, 

 arifolium, L. (Halbert-leaved Tear-thumb.) 



Low grounds. Common. Aug. 

 Sagittatum, L. (Arrow-leaved Tear-thumb.) 



Wet meadows, &c. Common. Aug. 

 Convolvulus, L. (Black Bindweed.) 



Cultivated grounds. Common. July, 

 dumetorum, L. (Climbing Buckwheat.) 



Moist thickets, &c. Frequent. Aug. 



2. Fagopyrum, Toum. 



esculentum, Maencli. (Buckwheat.) 



Old fields, &c. Frequent after crops of the same. 

 Aug. 



3. Rumex, L. 



obtusifblius, L. (Bitter Dock.) 



Fields and gardens. Common. July. 



