154 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE. 
[PLATE 64. ] 
65. Polygonum dumetorum Linnaeus. 
¢ 
Polygonum dumetorum Linnaeus, Sp. Pl. Ed. 2, 522 (1762); Gmelin, Syst. Nat. 2: 
639; Willdenow, Sp. Pl. 2: 456; Persoon, Syn. 1: 441; Meisner, Monog. 63 and in DC. 
Prodr. 14: 135; Wood, Am. Bot. and FI. 283. 
Perennial, bright green, glabrous throughout, somewhat scurfy, extensively twining. 
Stem weak, slender, climbing over shrubs and other supports, 6-40 dm. long, much 
branched, channeled; leaves ovate-cordate, 2-7 em. long, .5-4 em. broad, acuminate, 
petioled or nearly sessile toward the ends of the branches; petioles 1-2 cm. long; ocreae 
funnelform, oblique, 5-4 mm. long, acute or obtusish, glabrous; inflorescence axillary, 
consisting of clusters and racemes; racemes 3-8 cm. long, usually numerous, loose, in- 
terrupted, bearmg a few small leaf-like bracts; pedicels very slender, 5 mm. long, 
deflexed, articulated near the base; calyx yellowish-green, at length 5 mm. long, five- 
parted to near the base, the segments oblong, obtuse, the three outer ones keeled and in 
fruit much enlarged and conspicuously winged; wings crisped; stamens eight, included ; 
style .1 mm. long, three-parted, included; achene triquetrous, 2.5 mm. long, oblong, 
inclined to be pointed at both ends, black, smooth and shining. 
Missouri, Illinois and Tennessee. Also in Europe. 
