448 PHANEROGAMOUS PLANTS. 



2. RUMEX VENOSUS, Ptirsh. 



Hab. Interior of Washington Territory; especially along the Upper 

 Columbia and its tributaries ; eastward to the sources of the Missouri 

 and Platte. Dr. Newberry found it on the Cascade Mountains, 7000 

 feet above the sea, — Plant 12 to 18 inches high; the base often de- 

 cumbent. Leaves 2 to 5 inches long, and 1 or 2 inches ."wide ; the 

 lowest resembling the others, only broader. Yalves of the fructifer- 

 ous calyx larger than any known species (nearly an inch in diameter), 

 and always without a callosity. 



3. Rumex longifolius, DC, Meisner. 



Hab. Fraser's River, British Columbia, Dr. Holmes. — Plant 3 to 4 

 feet high. Lower leaves 6 or 7 inches long, ovate, oblong, rather 

 acute, undulate on the margin, cordate at the base. Fructiferous 

 panicle 1 J to 2 feet long, nearly leafless. Pedicels a little longer than 

 the fructiferous calyx ; valves nearly orbicular, 4 lines in diameter, 

 strongly reticulated, entire, or slightly crenulate toward the base, 

 without any callosity. This Rumex wholly resembles specimens of 

 R. domesticus, Hook., collected by Drummond, but may be different 

 from the European plant. The specific name of De Candolle is by 

 no means appropriate. 



4. Rumex salicifolius, Weinm. 



Hab. Upper Columbia, Washington Territory, southward to San 

 Francisco, California. — A widely diffused species, being indigenous 

 to the whole breadth of the continent from about latitude 40° 

 northward. 



5. Rumex Acetosa, Linn. 



Hab. Nisqually, Puget Sound ; in prairies. We have this plant 

 also from Gros Cape, on the north side of Lake Superior, where it 

 was found by Dr. Pitcher. 



