6 74 



POLYGONACEAE. 



Vol. I. 



i. Tiniaria Convolvulus (L.) Webb & Moq. 

 Black or Corn Bindweed. Fig. 1650. 



Polygonum Colvolvulus L. Sp. PI. 364. 17SS. 

 T. Convolvulus Webb. & Moq. loc. cit. 1836-40. 



Annual, glabrous, scurfy, stem twining or trailing, 

 6'-3° long, mostly branched, the internodes elon- 

 gated. Leaves ovate-sagittate or the i uppermost 

 lanceolate-sagittate, long-petioled, acuminate at the 

 apex, slightly ciliate, ¥-3 long ; ocreae oblique, short, 

 rough on the margin; axillary clusters or racemes 

 loosely flowered; flowers greenish, pendulous on 

 slender pedicels; calyx S-parted, closely investing 

 the achene, the outer lobes slightly or not at all 

 keeled ; stamens 8 ; style short, nearly entire ; stigmas 

 3 ; achene 3-angled, obovoid-pyramidal, Ii" long, 

 thick-pointed, black, granular, rather dull. 



In waste and cultivated grounds, nearly throughout 

 North America except the extreme north. Also in the 

 West Indies. Naturalized from Europe. Native of Asia. 

 Sometimes a troublesome weed. Calyx rarely 6-parted. 

 Bearbind. Ivy- or climbing-bindweed. Cornbind. Devil's- 

 tether. Knot- or blackbird-bindweed. July-Sept. 



2. Tiniaria cilinodis (Michx.) Small. 

 Fringed Black Bindweed. Fig. 165 1. 



P. cilinode Michx. Fl. Bor. Am. 1 : 241. 1803. 



P. cilinode erectum Peck, N. Y. State Mus. Rep. 46 : 



129. 1893. 

 T. cilinodis Small, Fl. SE. U. S. 382. 1903. 



Perennial, sparingly pubescent, stem red or 

 reddish, twining or prostrate, or nearly erect, 

 i°-io° long. Leaves broadly ovate or somewhat 

 hastate, acuminate at the apex, cordate at the 

 base, rather long-petioled, undulate, finely ciliate, 

 1 '-4' long, or the upper smaller; ocreae small, 

 armed with reflexed bristles near the base; ra- 

 cemes mostly panicled, axillary and terminal, 

 interrupted ; calyx whitish ; style short, 3-parted 

 to the base; achene 3-angled, oblong-pyramidal 

 or ovoid, nearly ii' long, very "smooth and 

 shining. 



In rocky places, Nova Scotia to Ontario, Minne- 

 sota and Pennsylvania, south in the Alleghanies to 

 North Carolina. Ascends to 2000 ft. in the Catskills. 

 June-Sept. 



3. Tiniaria scandens (L.) Small. Climbing 

 False Buckwheat. Fig. 1652. 



Polygonum scandens L. Sp. PI. 364. 1753. 

 Tiniaria scandens Small, Fl. SE. U. S. 382. 



1903. 



Perennial, glabrous, stem climbing, 2°-20° long, 

 rather stout, striate, branched, rough on the ridges. 

 Leaves ovate, acuminate, cordate at the base, i'-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 yellowish-green, 

 long-pedicelled ; calyx S-parted, the three outer seg- 

 ments very strongly winged and decurrent on the pedi- 

 cels, especially in fruit; stamens 8; style almost none; 

 stigmas 3 ; fruiting calyx S"-6" long, the wings crisped, 

 not incised; achene 2"-2i" long, 3-angled, rather blunt 

 at both ends, smooth, shining. 



In woods and thickets, Nova Scotia to Ontario and British 

 Columbia, south to Florida, Nebraska and Texas. Aug.- 



Sept. 



