Small : North American Polygonaceae 57 



Kootenai County, August 26, 1892, Sandberg, MacDoitgal & 

 Heller 966. Nevada: Unionville, September 1867, Watson 1033. 

 A species related to Polygonum ramosissimum, from which 

 however it differs in the smaller whitish or pinkish margined 

 calyx-lobes and the smaller and rougher achene. 



Persicaria omissa (Greene) 

 Polygonum omissum Greene, Pittonia 5 : 200. 1903. 



This species is known from both Kansas and Colorado. 



Bistorta bistortoides (Pursh) 

 Polygonum bistortoides Pursh, Fl. Am. Sept. 271. 18 14. 

 Polygonum Bistorta oblongifolium Meisn in DC. Prodr. 14 : 1 26. 



1856. 



This species of Bistorta is common in the mountains of Colo- 

 rado and also in the neighboring states. 



New York Botanical Garden. 



