253] FLORA OF BOULDER, COLORADO IO5 



125. RTJMEX L. Dock. 



329. R. Acetosella L. Sheep sorrel. 



Along railroads and roadsides, and in fields and waste 

 places, in 1906 still somewhat scarce, 5100-6000 ft. (Daniels, 

 589). Very common now (1910), along railways up to 9000 ft. 

 and higher (Ramaley). 



Europe: Asia, thence to North America. 



330. R. occidentalis S. Wats. Western dock. 

 In Bear Cafion, 6000-7000 ft. (Daniels, 710). 

 Labrador to Alaska; Texas to California. 



331. R. densiflorus Osterh. [R. Bakeri Greene]. Dense- 

 flowered dock. 



Subalpine bogs at Eldora, 8600-10000 ft. (Daniels, 908). 

 Wyoming to Colorado. 



332. R. crispus L. Curly dock. 



Fields and waste places and becoming common in ditches 

 and swales, .5100-5700 ft. (Daniels, 491). 

 Europe and Asia, thence to North America. 



333. R. salicifolius Weinm. Willow-leaved dock. 

 Common in ditches, shallow streams, and in swales and 



low meadows, 5100-10000 ft. (Daniels, 234). 



Labrador to Alaska ; Texas to Lower California : Eu- 

 rope. 



334. R. obtusifolius L. Bitter dock. 



Waste places and fields, 5100-6000 ft. (Daniels). 

 Europe and Asia, thence to North America. 



126. OXYRIA Hill. 



335. 0. digyna (L.) Hill. Mountain sorrel. 

 Creek-banks at Eldora; above timberline, Arapahoe Peak, 



8600-12000 ft. (Daniels, 844). 



Greenland to Alaska; New Hampshire to Arizona and 

 California: Europe: Asia. 



