PLANTS OF SOUTHERN NEW JERSEY. 425 



the coast, probably introduced, to some extent at least. It is 

 impossible, with the material at hand, and the rather involved 

 condition of the synonymy of this group, to positively settle 

 their identity. 

 Maritime. — Long Branch, Waretown, Anglesea, Cape May. 



Polygonum prolificum (Small). Bushy Knotweed. 



Polygonum ramosissimum var, prolificum Small, Bull. Torr. Bot. Club, XXI. 



171. 1894 [Exeter Neb.]. 

 Polygonum prolificum Bicknell, Bull. Torr. Bot. Club XXXVI. 449. 



Coast district frequent. 



Fr. — Early September into October. 



Maritime. — Spring Lake, Forked River, Harvey Cedars (L), Spray Beach 

 (L), Beach Haven Terrace (L), Cedar Bonnet (L), Sea Isle City, Stone 

 Harbor, Cape May. 



Polygonum atlanticum (Robinson). Atlantic Knotweed. 



Polygonum ramosissimum forma atlanticum Robinson, Rhodora IV : 72. 1902 



[Edgartown, Mass.]. 

 Polygonum ramosissimum Britton 210. — Keller and Brown 131. 



Frequent along the coast. I agree with Mr. Bicknell that P. 

 exsertum represents a plant in which the embryos are developing 

 prematurely in the seeds. 



Pr. — Early September into October. 



Maritime. — Seaside Park, Barnegat Pier, Barnegat City Jnc. (L), Har- 

 vey Cedars (L), Spray Beach (L), Ship Bottom (L), Surf City (L). 



Polygonum tenue Michx. Slender Knotweed. 



Polygonum tenue Michaux, Fl. Bor. Am. I. 238. 1803 [Canada]. — Pursh, 



Fl. Am. Sept. I. 270. 1814. — Britton 210. 

 Polygonum linifoliiim Barton, Fl. Phila. I. 186. 1818. 



Frequent in dry ground in the Northern and Middle districts. 

 and occasional on the coast and on the Cape May peninsula. 

 Fr. — Mid-August to early October. 



Middle District. — Keyport (C), New Egypt, Florence Heights, Birming- 

 ham, Camden (CP), Woodbury, Oaklyn (S), Mullica Hill (NB), Mickleton 

 (H), Swedesboro, Bridgeton. 



Pine Barrens. — Landisville, introduced? 



Coast Strip. — Forked River. 



Cape May.— Dias Creek, Cold Spring (OHB). 



