Class VHI. Order HI. 95 



Stem twining, climbing on other plants. Leaves alternate, 

 petioled, heart-shaped, with the hinder lobes acute. Branches 

 axillary. Flowers in terminal, interrupted spikes whitish, the 

 three principal segments of the calyx furnished with a keel, but 

 not winged. Flowers all summer in waste and cultivated 

 ground. Annual. 



POLYGONUM SCANDENS. L. Climbing Polygonum. 



Leaves heart-shaped ; stem twining, angular : 

 segments of the calyx winged. 



Stem smooth, climbing. Leaves petioled, heart-shaped, 

 with a deep sinus, acuminate. Branches axillary. Flowers in 

 long leafy racemes. Calyx much larger than in the last spe- 

 cies, with three broad, membranous expansions, corresponding to 

 the angles of the seed. Cambridge. August. ^Perennial. 



