MEMOIES FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE. 81 



Polygonum hydropiperoides Macouni Small. 



Polyyonum hydropiperoides var. strigosum Small, Bull. Torr. Club, 19: 355 (1892), 

 not P. strigosum R. Br. 



More robust than the type. Stem stout, 3-10 dm. long, clothed with strigose hairs; 

 leaves varying from oblong-lanceolate to narrowly lanceolate, obtuse, strigose or strigil- 

 lose ; Ocreae rather longer than in the type, densely strigose and fringed with long con- 

 spicuous bristles ; calyx white or whitish, often conspicuous. 



Ontario, West Virginia, Indiana and California. 



