MEMOIES FROM THE DEPARTMENT OF BOTANY OP COLUMBIA COLLEGE. 29 



Polygonum bistortoides linearifolium (S. Watson) Small. 



Polygonum Bistorta var. linearifolium S. Watson, Bot. King's Exp. 317 (1871). 



Polygonum bistortoides var. linearifolium Small, Bull. Torr. Club, 19: 352 (1892). 



More slender than the typical form ; stem erect, 2-4 dm. tall ; radical leaves lanceo- 

 late, 3-4 cm. long, acute ; cauline leaves few (three to live), 2-6 cm. long, linear-lanceo- 

 late or narrowly linear, revolute, sparingly hispidulous beneath ; raceme ovoid, less than 

 2 cm. long. 



Alpine and subalpine parts of the mountains of Colorado and Nevada. 



