MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE. 
Polygonum lapathifolium var. incanum Koch, Syn. Fl. Germ. 711 (1857); Coulter, 
Man. Bot. Rocky Mt. Reg. 319; A. Gray, Man. Ed. 6, 440 (1890). 
Small and slender. Stem erect, .5-5 dm. long, simple or branched, slightly scurfy ; 
leaves lanceolate, ovate or oblong, acute or obtuse, often attenuate at the bases, glabrous 
above, clothed with white tomentum beneath, short-petioled or subsessile; racemes ob- 
long, 1-8 cm. long, erect; achene lenticular, 2.5 mm. long, ovoid, slightly biconcave, 
dark brown, rather smooth and shining. 
Nova Scotia to Central New York westward to the Pacific, and in the Rocky 
Mountains. Also in Europe. 
Polygonum lapathifolium nodosum (Persoon) Small. 
Polygonum nodosum Persoon, Syn. 1: 440 (1805); Meisner in Mart. Fl. Bras. 5: 
16, and in DC. Prodr. 14: 118; Porter, Bot. Wheeler Ex. 232; S. Watson, Bot. Calif. 
2:13; Coulter, Man. Bot. Rocky Mt. Reg. 320; Behr, Fl. San Francisco, 276; Greene, 
Fl. Francis. 136, Man. Bay Reg. Bot. 41. 
Polygonum utriculatum Remy in Gay, Fl. Chil. 5: 267 (1849). 
Polygonum lapathifolium nodosum Small, Mem. Torr. Club, 5: 140 (1894). 
Generally robust and glabrous. Stem erect, 3-8 dm. long, stout, red or reddish, 
marked with purple spots and dark rings below the ocreae, usually much thickened at 
the nodes; leaves lanceolate or narrowly lanceolate, short-petioled or subsessile; ocreae 
cylindric, 1.5-2 em. long, loose, strongly ribbed; racemes oblong-cylindric, 2-6 em. long, 
erect, dense; style two-parted to below the middle; achene lenticular, 2 mm. long, 
broadly oblong or ovoid, black, shining but slightly granular. 
Range about the same as the type. Also in Chili. 
