9 2 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE. 



[Plate 33.J 

 33. Polygonum Virginianum Linnaeus. 



Pobjgornnii Virginianum Linnaeus Sp. PL 360 (1753); Gmelin, Syst. Nat. 2: 637; 

 Willdenow, Sp. PL 2: 442; Michaux, FL Bor. Am. 1: 238; Persoon, Syn. 1: 440; 

 ^Muhlenberg, 40; Pursh, FL Am. Sept. 270; Bigelow, FL Bost. 167; Elliott, Bot. S. C. 

 and Ga. 1: 454; Eaton, Man. 371; Barton, Comp. FL Phil. 1: 187; Sprengel, Syst. 2: 

 259; Torrey, FL 1 : 403, Comp. 172, FL N. Y. 2 : 151 ; Beck, Bot. 301 ; Hooker, FL Bor. 

 Am. 2: 132; Meisner, Monog. 81 and in DC. Prodr. 14: 112; Darhngton, Florula Cest. 

 48, FL Cest. 248; Eaton & Wright, N. A. Bot. Ed. 8, 367; A. Gray, Man. 389; Wood, 

 CI. Bk. Ed. 41, 475, Am. Bot. and FL 283; Chapman, FL S. States, 390; Darby, Bot. 

 S. States, 489. 



Polygonum muticuni Moench, Suppl. 266 (1802). 



Pemcarid Virginimm. Gaertner, Fruct. et Sam. 2 : 180. t 119 (1802). 



Annual, slender, nearly glabrous or strigose throughout. Stem erect or reclining, 

 3-13 dm. long, virgate, simple or virgatedly branched especially above; leaves ovate, 

 elhptic-ovate or ovate-lanceolate, 3-16 cm. long, 1-8 cm. broad, acuminate, short-petioled, 

 acute at the base, sparingly ciliate, the upper surface dark green, the lower lighter; 

 petioles 1-2.5 cm. long; ocreae cylindric, .5-1.5 cm. long, strigose, fringed with short 

 bristles ; inflorescence terminal and axillary, consisting of much elongated spicate racemes ; 

 racemes 1-6 dm. long, naked, much interrupted, virgate; ocreolae funnelform, 2 mm. 

 long, fringed with short bristles ; pedicels 3 mm. long, somewhat reflexed, conspicuously 

 articulated at the base of the calyx ; calyx greenish, 4-5 mm. long, unequally four-parted 

 to the middle or to the base, somewhat curved; stamens five, included; style 4 mm. 

 long, two-parted to the base, long exserted, the segments reflexed and curled at the tips ; 

 achene lenticular, 3.5-1 mm. long, ovoid-oblong, dark brown or cream-colored, smooth 

 and shining. 



Nova Scutia to Minnesota, south to Nebraska, Texas and Florida. 



