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Polygonum aviculare, Z. (KNOTGRASS.) 
A very common weed. (Nat. from Eu.) 
Polygonum erectum, LZ. (P. aviculare, var. erectum. Gray’s 
Manual.) 
Essex County (Rev. J. L. Russell); Ipswich (J. R.). Scarce. 
Considered an American plant. 
Polygonum maritimum, ZL. (Coast KNoTGRASS.) 
Beverly, Lynn, Ipswich, etc. 
Polygonum tenue, Michzx. 
Andover, Lawrence, Amesbury, Newbury, Lynn (Tracy), Danvers, 
etc. Frequent. 
Polygonum arifolium, Z. (HALBERD-LEAVED TEAR-THUMB. ) 
Common in damp places. 
Polygonum sagittatum, Z. (ARROW-LEAVED TEAR-THUMB.) 
In similar places. Common. 
Polygonum Convolvulus, Z. (BLack BINDWEED.) 
A climbing weed. (Nat. from Eu.) 
Polygonum cilinode, Michz. 
Danvers, 1840 (memo. Rey. J. L. Russell), Rockport, Andover 
(Mrs Downs), etc. Not very common. 
Polygonum dumetorum, Z., var. scandens. (CLIMBING FALSE 
BUCKWHEAT. ) 
Beverly, West Gloucester, Lynn (Tracy), Manchester (G. D. 
Phippen), etc. Frequent. 
Fagopyrum esculentum, Mench. (BuUCKWHEAT.) 
Frequent in cultivation, occasionally escaping, Lynn (Tracy), Dan- 
vers (J. H. Sears). (Adv. from Eu.) 
Rumex orbiculatus, Gray. (Great WaTER-DocK.) 
Essex County (Oakes), West Newbury, Swampscott. Scarce. 
Rumex salicifolius, Weinmann. (WHITE Dock.) 
Nahant (Tracy), Gloucester, Newburyport, etc., near the seashore. 
‘*First sent by Dr. Nichols from Danvers” (Bigelow’s Fl. Bost., 2d 
ed., 1824), 
Rumex crispus, Z. (CurRLED Dock.) 
A roadside weed. (Nat. from Eu.) 
Rumex obtusifolius, Z. (Birrer Dock.) 
A common weed. (Nat. from Eu.) 
Rumex Acetosella, Z. (FIELD or SHEEP SORREL.) 
Another ubiquitous weed. Noticed near Salem (1628) by Higginson 
and by some authors considered an American plant. Mr. Phippen 
mentions that strong plants in the garden bear tubers on the roots. 
(Nat. from Eu.) 

