164 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE, 
[Puare 69.] 
70. Polygonum arifolium Linnaeus. 
Polygonum arifolium Linnaeus, Sp. re 364 (1753); Gmelin, Syst. Nat. 2: 638; 
Walter, Fl. Car. 132; Willdenow, Sp. Pl. 2: 453; Michaux, Fl. Bor. Am. 1: 241; Per- 
soon, Syn. 1: 441; Muhlenberg, Cat. 41; a Fl. Am. Sept. 272; Bigelow, Fl. Bost. 
94; Eaton, Man. 372; Elliott, Bot. S. C. & Ga. 1: 459; Barton, Comp. Fl. Phil. 1: 189; 
Sprengel, Syst. 2: 258: Torrey, Fl. 1: 407, Comp. 137, Fl. N. Y. 2: 148; Beck, Bot. 303; 
Darlington, Florula Cest. 48, Fl. Cest. 251; Meisner, Monog. 65 and in DC. Prodr. 14 
134; Eaton & Wright, N. A. Bot. Ed. 8, 368; A. Gray, Man. 389; weed, Cl. Bk. Ed. 
475, Am. Bot. and Fl. 284; Chapman, FI. 8. States, 390; Darby, Bot. S. States, 490. 
Perennial or annual, glabrous below, bright green. Stem ascending and reclining, 
—9 dm. long, nearly simple or much branched, channeled and armed on the four angles 
with stout recurved prickles, the peduncles and pedicels glandular or pubescent; leaves 
broadly hastate, 2-18 cm. long, 1-16 cm. broad, cordate or subcordate, pubescent or 
glabrous on the lower surface, more or less constricted below or about the middle, the 
thin lobes acuminate; petioles 1-2 cm. long, these as well as the midrib and_ principal 
nerves of the leaf armed with recurved prickles; ocreae funnelform, oblique, .5-1 em. 
long, fringed at the summit with short bristles and at the base with short. bristle-like 
prickles; inflorescence terminal and axillary, consisting of suppressed panicled racemes or 
subcapitate clusters; racemes 1-2 cm. long, somewhat leafy, interrupted; bracts funnel- 
form, oblique, 2 mm. long; pedicels 2 mm. long; calyx greenish or rose-colored, four- 
parted to below the middle, the segments oblong, obtuse; stamens eight, included; style 
5-6 mm. long, two-parted to the base, included; achene lenticular, 4 mm. long, obovoid 
or oblong-oyoid, dark brown or variegated, very smooth and shining. 
New Brunswick to Minnesota south to South Carolina. 
