116 ' POLYGONACEAE 



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

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

 and Kans. Also in Eu. — Pennsylvania: Northampton; Lvcoming 



3. Polygonum Bellardi All. Bei<LARd'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,adei<phia, 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 



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

 Frankwn; Allegheny. 



5. Polygonum tenue Michx. SlEndER KnoTwEEd. (Man. p. 365 ; 

 I. 'F.f. 1346.) Dry soil, Ont. to Minn., Ga. and Ark. — Pennsylvania: 

 Northampton ; Delaware ; Lancaster ; Lebanon ; Lackawanna ; 

 Franklin ; Bucks ; Chester ; York. 



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

 I. F./. T336.) In woods, N. S. to Minn., Fla. and Tex. — Pennsylvania . 

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

 DELAWARE; Allegheny. 



7. Polygonum emersum (Michx.) Britton. Swamp PERSIcaria. 

 (Man. p. 360; I. F. /. r32i.) 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. _/. 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 Hartwrightli A. Gray. HarTwrighT's PERSIcaria, 

 (Man. p. 360 ; I. 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 inoamatum EU. Slender Pink Persicaria. 

 (Man. p. 360 ; I. F. 7; ^323.) In wet soil, Vt. to 111., Fla. and La.— Penn- 

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



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

 p. 361; I. F. y; ^324.) 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. F./. 1323. ) In moist soil, N. S. to Minn., Fla. and Tex. 

 — Pennsylvania : Northampton ; Bucks ; Philadelphia ; Franklin ; 

 Chester ; Lancaster ; Delaware ; Allegheny. 



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

 /. 1327.) In waste places, throughout N. Am., except the extreme 

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

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

 gheny. 



