POLYGONACE.E. 



717 





3. Climbing Polygonum. Polygonum Convolvulus, Linn. 

 (Fig. 863.) 

 (Eng. Bot. t. 941. Climbing Bucktvheat. Black Bindweed.) 

 A glabrous annual, with the twining 

 stem of a Convolvulus. Stipules short. 

 Leaves stalked, heart-shaped or broadly 

 sagittate, and pointed. Mowers in little 

 loose clusters ; the lower ones axillary, 

 the upper ones forming loose, irregular 

 terminal racemes. Styles 3. Fruiting 

 perianth not 2 lines long ; the 3 outer 

 segments closely surrounding the tri- 

 angular nut, and sometimes sharply 

 keeled on the midrib, but not winged. 



In cultivated and waste places, through- 

 out Europe, in central and Eussian Asia, 

 and North America, to the Arctic re- 

 gions. Frequent in Britain. FL sum- 

 mer and autumn. 



4. Copse Polygonum. Polygonum dumetorum, Linn. 



(Fig. 864.) 



(Eng. Bot. Suppl. t. 281.1.) 



Stem, foliage, and inflorescence of the 

 climbing P., of which it may be a mere 

 variety ; but it is more luxuriant, and 

 the 3 angles of the fruiting perianth are 

 more or less expanded into a white, 

 scarious wing, which is often decurrent 

 on the pedicel, the whole perianth being 

 often 3 lines long. The nut is also 

 usually more shining. 



In hedges, open woods, or rich, cul- 

 tivated places, in Europe, Russian Asia, 

 and North America, but not so com- 

 mon, nor extending so far northward, as 

 the climbing P. In Britain, chiefly in 

 the southern counties of England. Fl. 

 end of summer, and autumn. 



Ficr. 864. 



