116 POLYGONACEAE 



2. Polygonum littorale Link. Shore KnoTweed. (Man. p. 363 

 I. v./. 1338.) On shores and in waste places, N. B. to Calif., Va., Ill 

 and Kans. A\so \n Uu .— Pennsylvania : Northampton; Lycoming 



3. Polygonum Bellardi All. Bellard's KnoTweed. (Man. p. 363 

 I. F. f- 1339.) In waste grounds. Locally in the eastern U. S. Adv 

 from eastern Eu. or western Asia. — Pennsylvania: Phii,adeIvPHIA, Mif- 

 flin St. Wharf. 



4. Polygonum erectum L. ERECT Knotweed. (Man. p. 364; I. F. 

 /". 1342.) In moist or dry soil, Out. to the N. W. Terr., Tenn. and 

 Aryi.— Pennsylvania : Northampton ; Bucks ; Chester ; Lancaster : 

 Frankwn; Ali,egheny. 



5. Polygonum tenue Michx. Slender KnoTweed. (IMan. p. 365 ; 

 I. V.f.1346.) Dry soil, Ont. to Minn., Ga. and Ax'k.— Pennsylvania : 

 Northampton ; Delaware ; Lancaster ; Lebanon ; Lackawanna ; 

 Franklin ; Bucks ; Chester ; York. 



6. Polygonum Virginianum L. Virginia Knotweed. (Man. p. 363; 

 I. F.y. 7336.) In woods, N. S. to Minn., Fla. and l^n.— Pennsylvania : 

 Northampton ; Bucks ; Erie ; Franklin ; Lancaster ; Chester ; 

 Delaware; Allegheny. 



7. Polygonum emersum (Michx.) Brilton. Swamp Persicaria. 

 (Man. p. 360; I. F\ y". 732/.) In swamps or moist soil, Ont. to B. C, 

 Va., La. and Mex. — Pennsylvania: Northampton; Bucks; Lan- 

 caster ; Franklin ; Dauphin ; Chester. 



8. Polygonum amphibium L. Water Persicaria. (Man. p. 360; 

 I. F. y. 1319.) In ponds and lakes, Quebec to Alaska, northern N. Y., 

 Ky., Colo, and Calif. Also in Eu. — Pennsylvania : Huntingdon, in the 

 Juniata ; ERIE ; LANCASTER ; NORTHAMPTON. 



9. Polygonum Hartwiightii A. Gray. HarTwright's Persicaria. 

 (Man. p. 360 ; I. F. f. /320.) In swamps or moist soil, Hudson Bay 10 

 Ore., Pa., Kans., Nev. and Lower Calif. — Pennsylvania: Franklin; 

 Crawford, Hammarby ; Monroe, Delaware Water Gap. 



10. Polygonum incarnatum EU. SLENDER Pink Persicaria. 

 (Man. p. 360 ; I. F. /. J323.) In wet soil, Vt. to 111., Fla. and ha. — Penn- 

 sylvania: Northampton ; Lancaster; Dauphin ; Franklin ; York. 



11. Polygonum lapathifolium L- Dock-leaved Persicaria. (Man. 

 p. 361; I. F. y] i3-4-) In waste places, throughout temperate N. Am. 

 Nat. from Eu. Native also of Asia. — Pennsylvania : Chester, W. 

 Chester. 



12. Polygonum Pennsylvanicum L. Pennsylvania Persicaria. 

 (Man. p. 361 ; I. V. f. 1323. ) In moist soil, N. S. to Minn., Fla. aud Tex. 

 — Pennsylvania : Northampton ; Bucks ; Philadelphia ; Franklin ; 

 Chester ; Lancaster ; Delaware ; Allegheny. 



13. Polygonum Persicaria L. Lady's Thumb. (Man. p. 361 ; I. F. 

 /. 132J.) In waste places, throughout N. Am., except the extreme 

 north. Nat. from Eu. — Penttsylvania : Northampton ; Bucks ; Erie ; 

 Franklin ; Chester ; Lancaster ; Monroe ; Delaware ; Alle- 

 gheny. 



