156 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE, 
[PLATE 65.] 
66. Polygonum cristatum Engelmann « Gray. 
Polygonum cristatum Engelmann & Gray, Bost. Journ. Nat. Hist. 5: 259 (1847); 
Meisner in DC. Prodr. 14: 156. 
Perennial, slender, very scurfy, somewhat rigid. Stem twining, 5-20 dm. long, 
more or less branched, somewhat channeled and twisted; leaves ovate, triangular-ovate 
or triangular, 1-6 em. long, .5-3.5 em. broad, varying from cordate to truncate, acute or 
acuminate, undulate and obscurely eroded, short-petioled; petioles slender, 1-2 cm. long; 
ocreae funnelform or somewhat cylindric, 2-4 mm. long, hardly oblique; flowers in axil- 
lary racemes; racemes 2-4 em. long, loosely flowered, naked, interrupted; pedicels 5 
mm. long, very slender, articulated near the middle; calyx greenish white, 4-5 mm. 
long, five-parted to near the base, the three outer divisions keeled and winged in fruit, 
the wings more or less incised; stamens eight, included; styles united to the summit; 
stigmas three; achene triquetrous, 2.5-3 mm. long, oblong, black, smooth and shining. 
Texas, Georgia, South Carolina and southeastern New York. 
