106 POLYGON ACE M. 



13. P. Convolvulus, L. Black Bindweed. 



Sterns twining or procumbent, roughish; leaves cordate-hastate, pointod; flowers 

 in small intcrruptcdracenics; calyx segments obtusely keeled; stamens S; styles Z; 

 fruit smoothish. 



, Cultivated nod waste grounds, common. July — Sept. A climbing plant i 

 feet Ion';, with rougbish angled stems. ■ 2 inches long, ]/, as wide, 



Bomei Flowers whitish. 



14. P. cilinode, Miohx* Fringe-jointed False Buckwheat. 



Minutely downy; sheath fringed at base with rsflexed bristles; leaves cordate aud 

 slightly hastate, acuminate ; racemes panjelcd ; stameniS; styles 3. 



Open woods and rocky bills, common. July — Seyt. Stems climbing 3 to 9 f ct. 

 Flowers whitish. 



15. P. DUMETORUM, L. Cli'm 1 it. 

 Smc I; leaves heart-shaped or I; r.i- 



cemes interrupted, leafy; 3 outer ealyx-lobcs strongly keeled, and in fruit winged; 

 fruit smooth i 



imraon. Aug. Firm twining 8 to 12 feet over bashes. Leaves 

 with-disti 



f, Tourn. tfalyxpet 

 achenianS-si Is, with triuiii lcdr§ 



racemes or pa - . color. 



1G. P. Fagopyrum, L. Buckwheat. 



Smoottrish; gittate; race m ; flowers 8,' ho 



glands interposed between the Stamens ;/»*M^twic'a as long 

 and entire angles. (Fagopyruih esc;. m.) 



Old fields, c gcaped from cultivation. June — Sept. A valuable grain, mac! 

 tivatcd en poor land. Stems '2 to 4 feet high. Leaves : 

 wide. Flcwi ;e, fragrant. 



2. IITJMEX, Linn. Dock. Sol: 



The ancient Latin name of unknown , 



Calyx of Gsrpr.l?, persistent, the 3 outer herbaceous, I 

 o inner large, somewhat colored, valvately convergent over 

 the 3-angled aeheaium. S stigmas 



tufted. — Coarse herbs, vnth small mostly greenish jUmer^ 

 commonly whorled inpfmicUd racemes. 



*Lapateom, Tourn- Flowers, perfect, or sometimes potygamou s; in- 



ner 'sepals bearing grain-like tuber dies; . at th& . 



lasc. 



1, R. verticillatus, L. Swamp Dock. 



Leaves lanceolate, acute^ flak .elongated, tbc flowers in 



crowded whorls; sheaths cylindrical; valves broad-cordate, entire, each be 

 very large grain. 



Wet swemps and ditches, rather comman. June. July. Stem 2 to 4 feet ' 

 branched above. Leaves lone, palt • ith conspicuous sheaths, 



WhtrU few-flowered. Ildixh % to 1 inch long, 



2. R. obtusipolius, L. Broad-leaved Dock. 



Stem roughish; lowest leaves 07at2-ccrdate, obtuse, rather downy on the veins u:> 



