258 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



F. TATARicuM (L.) Gaertn. India-wheat. — In grainfields and 

 waste ground, Sheffield (Churchill). 



POLYGONUM. Knotweed. 

 {Persicarid 111. Fl. ed. 7 in part.) 



P. acre HBK., var. leptostachyum Meisn. Water Smartweed. 

 — Low ground; common. 



P. amphibium L. — {Persicaria am'phihia III. Fl. ed. 2.) 



In shallow water or on muddy shores; common. 



var. Hartwrightii (Gray) Bissell. B'^rders of swamps and in 

 marshes; frequent. 



forma terrestre (Leers) Blake. — (var. terrestre Man. ed. 7; 

 md. Rhodora, 15: 164, 1913.) 



Muddy shores; occasional. Pittsfield; Stockbridge. Specimens 

 collected at Lake Averic, Stockbridge, show the above variety and 

 the form growing from the same rootstock. 



P. arifolium L. Halberd-leaved Tear-thumb. — ( Tracaulon 

 arifoliuvi 111. Fl. ed. 2.) 



Swamps and low ground; frequent. 



P. aviculare L. Knotgrass; Doorweed.-^ Dooryards, road- 

 sides and cultivated ground; common. 



var. angustissimum Meisn.^ — On ledges bordering Guilder Pond, 

 Mt. Washington. Altitude 2000 feet. 



var. vegetum Ledeb. — Yards, roadsides and cultivated ground; 

 common. 



P. Careyi Olney. — (Persicaria Carcyi 111. Fl. ed. 2.) 



Border of Rudd Pond, Becket. 



P. cilinode Michx. Bindweed. — ( Tinaria cilinodis 111. Fl. ed. 2.) 



Rocky woods and on ledges; common. 



P. Convolvulus. Black Bindweed.— ( Tinaria convolvulus 111. 

 Fl. ed. 2.) 



Cultivated ground and clearings; common. 



P. erectum L. — Yards and roadsides; occasional. Williamstown 

 (Churchill); Lenox; New Marlboro (Walters). 



P. Hydropiper L. Common Smartweed; Water Pepper. — 

 {Persicaria Hydropiper III. Fl. ed. 2.) 



Moist shaded ground; common. 



P. hydropiperoides Michx. Mild Water Pepper. — {Persicaria 

 hydropiperoides 111. Fl. ed. 2.) 



