148 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE. 



[Plate 61. J 

 62. Polygonum Convolvulus Linnaeus. 



Polygonum Convolvulus Linnaeus, Sp. PL 364 (1753); Gmelin, Syst. Nat. 2: 639; 

 Willdenow, Sp. PL 2 : 455 ; Michaux, FL Bor. Am. 1 : 241 ; Persoon, Syn. 1 : 441 ; 

 Pursh, FL Am. Sept. 273 ; Bigelow, FL Best. 94 ; Muhlenberg, Cat. 41 ; Elliott, Bot. S. C. 

 & Ga. 1: 459; Barton, Comp. FL PhiL 1: 189; Sprengel, Syst. 2: 254; Torrey, FL 1: 

 406, Comp. 173, FL N. Y. 2: 146; Beck, Bot. 303; Hooker, FL Bor. Am. 2: 131; Meis- 

 ner, Monog. 62 and in DC. Prodr. 14: 135; Darlington, Florula Cest. 49, FL Cest. 252; 

 Eaton & Wright, N. A. Bot. Ed. 8, 368; A. Gray, Man. 390; Wood, CL Bk. Ed. 41, 475. 

 Am. Bot. and FL 283; Chapman, FL S. States, 390; Darby, Bot. S. States, 491 ; S. Wat- 

 son, Bot. Cahf. 2: 15; Reade, PL Bermud. 68; Behr, FL San Francisco, 276; Greene, FL 

 Francis. 138. 



Annual, glabrous but scurfy, of a dull green or pale green color. Stem prostrate, 

 slender, ascending or twining, 1-12 dm. long, branched from near the root and usually 

 also above or sometimes simple, the internodes of the older branches greatly elongating ; 

 lea\'es broadly or narrowly ovate or ovate-sagittate, the uppermost nearly sagittate, 1.5- 

 6 cm. long, .5-4 cm. broad, acuminate at the apex, cordate or truncate at the base, some- 

 what undulate and crisped, very slightly ciliate ; petioles slender, 1-5 cm. long ; ocreae 

 funnelform, oblique, 2-4 mm. long, acute, rough on the edges; inflorescence consisting 

 of axillary clusters or racemes; flowers several in a cluster; racemes simple, 1-6 cm. 

 long, loosely flowered, interrupted; pedicels very slender, 2-3 mm. long, reflexed or 

 deflexed; calyx green, at length 3.5-4 mm. long, five-parted to below the middle or to 

 near the base, closely investing the fruit, the segments oblong, obtuse, the three outer ones 

 sometimes keeled ; stamens eight, included ; style about .4 mm. long, entire, the stigma 

 three-cleft, somewhat exserted; achene triquetrous, 3.5 mm. long, broadly obovoid or 

 oblong-obo\'oid, short-pointed, black, granular, rather dull. 



Throughout North America, except the extreme north. Naturalized from Europe. 



