566 POLYGONACEAE. 
33. Polygonum scandens L. Climbing 
False Buckwheat. (Fig. 1351.) 
Polygonum scandens I,. Sp. Pl. 364. 1753. 
Perennial, glabrous, stem climbing, 2°-20° long, 
rather stout, striate, branched, rough on the ridges. 
Leaves ovate, acuminate, cordate at the base, 1/-6/ 
long or the upper smaller, the larger long-petioled, 
finely punctate, the margins scabrous; ocreae oblique, 
smooth and glabrous; racemes usually numerous and 
panicled, interrupted, leafy, 2’-8’ long; flowers yel- 
lowish-green, long-pedicelled; calyx 5-parted, the 
three outer segments very strongly winged and decur- 
rent on the pedicels, especially in fruit; stamens 8; 
style almost none; stigmas 3; fruiting calyx 5’’-6’’ long, 
the wings crisped, not incised; achene 2//-2'4’ long, 
3-angled, rather blunt at both ends, smooth, shining. 
In woods and thickets, Nova Scotia to Ontario and the 
Rocky Mountains, south to Florida, Nebraska and Texas. 
Aug.-Sept. 
34. Polygonum dumetorum [L,. Copse or Hedge Buckwheat. (Fig. 1350.) 
Polygonum dumetorum J,. Sp. Pl. Ed. 2, 522. 1762. . 
Perennial, glabrous, similar to the preceding spe- 
cies, stem extensively twining, 2°-12° long, striate, 
much branched. Leaves ovate or somewhat has- 
tate, and sometimes inequilateral, acuminate at the 
apex, cordate at the base, 1/-21%4’ long, long peti- 
oled, or the upper smaller and nearly sessile; ocreae 
oblique, smooth; racemes mostly axillary, numer- 
ous, much interrupted, leafy-bracted, 2-5’ long; 
flowers yellowish green, pendulous; calyx 5-parted, 
the three outer segments winged or keeled and 
much enlarged in fruit; stamens 8; style short, 
3-parted; fruiting calyx 3//-4/’ long, the wings 
nearly flat, not incised; achene oblong, 3-angled, 
2’/ long, inclined to be pointed at both ends, black, 
smooth, shining. ’ 
Prairies of Illinoisand about St. Louis, Mo. Also in 
the vicinity of Knoxville, Tenn. Naturalized from 
Europe? July-Sept. 
35- Polygonum cristatum Engelm. & 
Gray. Crested False Buckwheat. 
(Fig. 1352.) 
Polygonum cristatum Engelm. & Gray, Bost. 
Journ. Nat. Hist. 5: 259. 1847. 
Perennial, scurfy, stem slender, twining, 2°— 
10° long, more or less branched. Leaves trian- 
gular or ovate, 1/-5’ long, acuminate at the 
apex, undulate, truncate or cordate at the base, 
rather long-petioled; ocreae cylindric-funnel- 
form; flowers in axillary simple or compound 
often naked racemes 1/-5/ long; pedicels about 
2'4’’ long, jointed near the middle; calyx 
greenish-white, 2’/-2'4’’ long, 5-parted to near 
the base, the 3 outer segments keeled and at 
maturity winged; stamens 8, included; style 
none; stigmas 3; fruiting calyx 3’’-4’’ long, its 
wings incised; achene 3-angled, oblong, black, 
smooth, shining, about 114’’ long. 
Sandy woods and rocky banks, southern New York to Georgia, the Indian Territory and Texas. 
Aug.-Oct. 
