110 MEMOIRS FROM THE DEPARTMENT OF BOTANY OP COLUMBIA COLLEGE. 



[Plate 42.] 

 42. Polygonum erectum Linnaeus. 



Polygomim erectum Linnaeus, Sp. PL 363 (1753); Gmelin, Syst. 2: 639; Persoon, 

 Syn. 1 : 439; Willdenow, Sp. PI. 2: 450; Muhlenberg, Cat. 40; Sprengel, Syst. 2: 256; 

 Darlington, Florula Cest. 48, Fl. Cest. 248; Beck, Bot. 300; Eaton & Wright, N. A. Bot. 

 Ed. 8, 367; Wood, CI. Bk. Ed. 41, 474; Porter & Coulter, Syn. Fl. Colo. 123; Coulter, 

 :\Ian. Bot. Rocky Mt. Reg. 318. 



Polygonum aviculare yav. latifolmm Michaux, Fl. Bor. Am. 1: 237 (1803); Nuttall, 

 Gen. 1 : 254; Barton, Comp. Fl. Phil. 186; Torrey, Fl. 1: 400; Wood, CI. Bk. Ed. 41, 474. 



Polygomim aviculare var. erectum, Meisner, Monog. 88 (1826) and in DC. Prodr. 14: 

 97; Torrey, Fl. N. Y. 2 : 152; A. Gray, Man. 388; Wood, Am. Bot. and Fl. 283. 



Annual, stout, glabrous throughout, green when young, at length turning yellowish- 

 green. Stem erect or ascending and somewhat spreading, 2-6 dm. long, nearly simple or 

 much branched, becoming woody, conspicuously ridged ; leaves oval, oblong or obovate, 

 1-6 cm. long, .5-2 cm. broad, mostly acuminate at the base, sessile or subsessile, some- 

 times short-petioled, obtuse or acutish, joined to the ocreae by a conspicuous articulation ; 

 ocreae funnelform, oblique, .3-1 cm. long, two-parted and silvery when young, becoming 

 lacerate and brown with age; inflorescence axillary, consisting of clusters of several 

 floAvers; pedicels 2-2.5 mm. long; calyx greenish, 3 mm. long, five-parted to below the 

 middle, the segments oblong, obtuse, paler or whitish on the margins ; stamens six or 

 sometimes five, included ; style . 1 mm. long, three-parted to below the middle, included ; 

 achene triquetrous, 3 mm. long, pyramidal-ovoid or broadly ovoid, dark-brown, granular 

 and dull. 



Ontario to the Northwest Territory south to Georgia, Texas and Colorado. 



