No. 14.] FLOWERING PLANTS AND FERNS. 163 



Frequent. Shallow water of swamps, margins of ponds 

 and streams. July — Sept. 



Polygonum virginianum L. 



Frequent. Woods and thickets in rich soil. July — Sept. 



Polygonum arifolium L. (arum-leaved). 



Halberd-leaved Tear-thumb. Scratch or Sickle Grass. 



Occasional. Swamps, wet woods and thickets. July — 

 Oct. 



Sometimes used medicinally. 



Polygonum sagittatum L. (arrow-head shaped). 

 Arrow-leaved Tear-thumb. Scratch Grass. 



Frequent. Swamps and wet places. June — Oct. 



Polygonum Convolvulus L. (like Convolvulus, the Bindweed). 

 Wild Buckwheat. Black, Corn, Sow or Blackbird Bindweed. 

 Frequent or common. Cultivated or waste grounds. June 

 — Oct. Naturalized from Europe. 



Polygonum cilinode Michx. (having fringed nodes). 

 Fringed Black Bindweed. 



Rocky woods and more open places. Rare over most of 

 its range: North Stonington (Graves), Norwich (Mrs. E. E. 

 Rogers), Farmington (Weatherby), New Haven, Seymour 

 and Naugatuck (Harger), Waterbury (A. E. Blewitt), Ham- 

 den and Monroe (Eames). Occasional throughout northern 

 Litchfield County. June — Sept. 



The var. erectum Peck (upright), var, breve Peck, occurs 

 with the species in Litchfield County. 



Sometimes used as a cover-plant for rocks. 



Polygonum scandens L. (climbing). 



Polygonum dumetoriim L., var. scandens Gray. 

 Climbing False or Wild Buckwheat. Hedge, Bush or Thicket 

 Bindweed. 

 Common. Thickets and waste places. Aug. — Oct. 



Polygonum dumetorum L. (of thickets). 

 Bush or Thicket Buckwheat or Bindweed. 



Rare. On ledges or rocky banks, in open woods or partial 

 shade: Stratford, Trumbull and Huntington (Eames), Wood- 



