ayi] FLORA OF COLUMBIA AND VICINITY 1 29 



127. RUMEXL. Dock. 



330. R. salicifolius Weinm. White dock. 

 Swales; scarce. 



Labrador to British Columbia; Florida to Lower 

 California. 



331. R. verticillatus L. Swamp dock. 

 Swamps, especially along Roche Perche creek. 

 Quebec to Michigan and Iowa; Florida to Texas. 



332. R. altissimus Wood. Tall dock. 

 Occasional along creeks. 



Massachusetts to Michigan and South Dakota; Mary- 

 land to Texas. 



333. R. crispus L. Curled dock. 



Common in fields and waste places, and in low grounds. 

 Europe and Asia, now cosmopolitan. 



334. R. obtusifolius L. Bitter dock. 



Very common in cultivated and waste grounds. 

 Europe and Asia, now almost cosmopolitan. 



335. R. persicarioides L. [R. nuiritimus Auct.]. Golden 

 dock. 



Shores of the Missouri River. 



New Brunswick to British Columbia; North Carolina 

 to Kansas and California. 



336. R. Acetosella L. Sheep sorrel. 

 Meadows and waysides; still uncommon, but increasing 

 its area year by year. 



Europe and Asia, thence to all but torrid lands. 



128. POLYGONUM L. \TOVARA Adans.}: PER- 

 SICARIA Adans.: TRACAULON Raf.: 77- 

 NIARIA Reichenb.]. Knotweed. Smartweed. 



337. P. littorale Link. Shore knotweed. 



Waste places, especially along cinder-walks and railroad 

 tracks on coal ashes, where little else grows. 



Europe and North America. 

 9 



