MEMOIES FROM THE DEPAETMENT OF BOTANY OF COLUMBIA COLLEGE. 33 



Polygonum alpinum Alaskan um Small. 



Polygonum alpinum var. lapathifolmm Chamisso & Schlechtendal, Linnaea, 3 : 38 

 (1828), not P. lapathifolium Linnaeus. 



Polygonum polymorphum var. lapathifolium Ledebour, Fl. Ross. 3: 254 (1849). 



Stout, arising from a large rootstock. Stem erect, 5-9 dm. long, fleshy above ; leaves 

 ovate-lanceolate, 8-22 cm. long, 1-8 cm. broad, acuminate, obtuse or cordate at the base, 

 thin, pubescent on both surfaces or sometimes glabrous, ciliate, undulate, much crisped ; 

 petioles 1-4 cm. long ; ocreae funnelform, 2-4 cm. long, thin, striate, more or less hispid. 



Alaska and southward on the high mountains to Washington. 



