l6o CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Polygonum aviculare L. (pertaining to birds). 



Doorweed. Knotweed. Wire, Goose, Way, Knot or Crab 



Grass. Bird's-tongue. 



Common. Yards, waste places, roadsides and cultivated 

 grounds. June — Oct. 



A pernicious weed in lawns, often taking complete posses- 

 sion. The seeds are eaten by certain birds ; the Chinese also 

 extract a blue dye from the plant. 

 Polygonum aviculare L., var. littorale (Link) Koch (of the 



sea-shore). 

 Polygonum littorale Link. 

 Shore Knotweed. 



Occasional on edges of salt marshes and on gravelly shores 

 near the coast. July — Sept. 

 Polygonum aviculare L., var. vegetum Ledeb. (vigorous). 



This variety has been collected at a few localities and 

 doubtless occurs occasionally with the typical form. Its dis- 

 tribution is not known. July — Sept. 



Polygonum erectum L. (erect). 

 Erect Knotweed or Goose Grass. 



Frequent. Roadsides and waste places. July — Sept. 



Polygonum ramosissimum Michx. (much-branched). 



Bushy Knotweed, 



Rare. Roadside in Ansonia, probably introduced from the 

 West (Harger). Aug. — Oct. Native in the West. 



The forma atlanticum Robinson, our native representa- 

 tive of this species, is frequent about the borders of salt 

 meadows and on tidal shores along the coast. 



Polygonum tenue Michx. (slender). 

 Slender Knotweed. 



Frequent. Dry sterile fields and open sandy or rocky 

 places. July — Sept, 



Polygonum lapathifolium L. (dock-leaved). 



Polygonum lapathifolium L., var, incarnatum Wats. 

 Polygonum incarnatum of authors and ( ?) Ell. 

 Dock-leaved, Pale or Willow Persicaria. 



Rare, local or occasional. Waste places and banks of 



