110 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE, 
[PLATE 42.] 
42. Polygonum erectum Linnaeus. 
Polygonum erectum Linnaeus, Sp. Pl. 363 (1753); Gmelin, Syst. 2: 659; Persoon, 
Syn. 1: 439; Willdenow, Sp. Pl. 2: 450; Muhlenberg, Cat. 40; Sprengel, Syst. 2: 256; 
Darlington, Florula Cest. 48, Fl. Cest. 248; Beck, Bot. 300; Eaton & Wright, N. A. Bot. 
Kd. 8, 367; Wood, Cl. Bk. Ed. 41, 474; Porter & Coulter, Syn. Fl. Colo. 123; Coulter, 
Man. Bot. Rocky Mt. Reg. 318. 
Polygonum aviculare var. latifolium Michaux, Fl. Bor. Am. 1: 257 (1803); Nuttall, 
Gen. 1: 254; Barton, Comp. FI. Phil. 186; Torrey, Fl. 1: 400; Wood, Cl. Bk. Ed. 41, 474. 
Polygonum 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, .56—2 em. 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, .5-1 cm. long, two-parted and silvery when young, becoming 
lacerate and brown with age; inflorescence axillary, consisting of clusters of several 
flowers; 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. 
