l()(i MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE. 



[Plate 40.] 

 40. Polygonum Bellardi Allioni. 



Polygonaiu Bellanll Allioni, FI. Pedem. 2: 205. t. 90. f. ^^(1785); Gmeiin, Syst. Nat. 

 2: 039; Persoon, Syn. 1 : 439; Meisner in DC. Prodr. 14: 98. 



iVnnual, glabrous, dingy-green or straw-colored. Stem erect or spreading and ascend- 

 ing, 2-9 dm. long, \v iry, simple or much branched, ridged ; leaves varying from oblong- 

 lanceolate to linear-lanceolate, sometimes oblanceolate, .5-4 cm. long, .1-9 cm. broad, 

 acute, conspicuously nerved beneath, acuminate at the base, never crowded, short-petioled ; 

 petiole articulated at its junction with the ocrea; ocreae oblique, 5-7 mm. long, two-parted 

 or slightly lacerate when young, Ijecoming much lacerate and brown with age ; inflores- 

 cence axillary, the clusters with two or three flowers ; pedicels slender, about 3 mm. long ; 

 calyx green, 2 mm. long, five-parted to below the middle, the segments oblong, obtusish 

 with a white border; stamens eight, included; style .1-.2 mm. long, three-parted to the 

 base, included or somewhat exserted at maturity; achene triquetrous, 2-2.5 mm. long, 

 varying from ovoid to oblong-ovoid, dark-brown, pointed at both ends, granular and 

 rather dull. 



In waste places, Washington, D. C. Adventive from western Asia or eastern Europe. 



