Polygonum 



POLYGONACEAE 



417 



o 5o 



Map 855 



Polygonum Convolvulus L. 



5 ~50 



Map 857 



Polygonum scandens L. 



frequent throughout the state in low places in almost all types of woods. 

 N. S. to Minn., southw. to Fla. and Tex. 



19. Polygonum arifolium L. var. lentiforme Fern. & Grisc. (Rho- 

 dora 37: 167. 1935.) (Polygonum arifolium L. in part and Tracaulon ari- 

 folium (L.) Raf.) Halberdleaf Tearthumb. Map 853. Infrequent to 

 rare in springy and swampy places throughout the state. This species is 

 much visited by honey bees. 



P. E. I. to s. Ont., southw. to N. J., Pa., Ohio, Ind., and Mich. 



20. Polygonum sagittatum L. (Tracaulon sagittatum (L.) Small.) 

 Arrowleaf Tearthumb. Map 854. Frequent to infrequent throughout 

 the state in ditches, in low ground in wooded ravines and along streams 

 and about ponds and swamps. 



Newf. to Sask., southw. to Fla. and Tex. 



21. Polygonum Conv6lvulus L. (Tiniaria Convolvulus (L.) Webb & 

 Moquin.) Black Bindweed. Map 855. Probably infrequent in all parts 

 of the state, although there are no reports from the southwestern part. A 

 weed mostly of roadsides and fields, and rarely in woodland. 



Nat. of Eu. Throughout temperate N. A. 



22. Polygonum dumetorum L. (Tiniaria dumetorum (L.) Opiz of 

 Britton and Brown, Illus. Flora, ed. 2.) Map 856. This and the next 

 species are not easily separated unless mature fruits are at hand. Some 

 authors believe this species is a native, while others regard it as a native 

 of Eurasia. There have been 15 reports for this species from Indiana. 

 Some authors do not discuss it and some say that it is common. Those who 

 say it is common have, no doubt, confused it with P. scandens, and I be- 

 lieve most of our reports should be referred to that species. One of our 

 specimens is from a roadside and the other is from the low border of 

 the east side of the Lake of the Woods, which is near a roadside in Mar- 



