■116 



POLYGONACEAE 



Polygonum 



o 5o 



Map 849 



Polygonum Persicaria L. 



Polygonum hydropiperoides Michx. 



50 



Map 853 

 Polygonum aritolium L. 

 I var. lentiforme Fernald & Griscom 



~W 



Map 854 



Polygonum sagittatum L. 



densely strigose can be found, I prefer to say that the species varies from 

 glabrous to densely strigose. 



Polygonum setaceum Bald. var. inter jectum Fern., a closely related spe- 

 cies, has been reported by Fernald (Rhodora 40: 414. 1938), after the 

 manuscript of the Flora was written, as having been found by Peattie under 

 buttonbush at the edge of a Chamaedaphne bog near Rolling Prairie, 

 La Porte County. 



17. Polygonum orientale L. Princes-plume. Map 851. This species 

 is cultivated as an ornamental and has been reported as an escape through- 

 out the state. 



Nat. of India, China, Japan; naturalized and escaped throughout east- 

 ern N. A. 



18. Polygonum virginianum L. (Tovara virginiana (L.) Raf.) Vir- 

 ginia Knotweed. Map 852. This is strictly a woodland species and is 



