Class VIII. Order 111. 

 POLYGONUM PERSICA-RIA. L. Spotted Polygonum. 



Stamens six ; styles two, half united; spikes 

 ovate-oblong, erect ; peduncles smooth ; stipules 

 ciliate. Curt. 



This plant is without acrimony. Leaves spreading, lanceo- 

 late, acute, and commonly marked with a dark spot, somewhat 

 heart-shaped, in the centre. Stipules tubular, short, ciliated at 

 top. Spikes terminal, on smooth footstalks, erect, oblong. 

 Flowers rose coloured. In the same soils as the last. July, 

 August. Annual. 



POLYGONUM SAGITTATUM. L. Scratch grass. 



Stem prickly backward; leaves sagittate ; flow- 

 ers in heads, with eight stamens and three' styles. 

 Mich. 



Stem slender, four angled, the angles rough backward with 

 small prickles. Leaves arrow-shaped, oblong, on short peti- 

 oles, the petiole and mid rib rough backward. Flowers in 

 small heads on the ends of the branches, white or purplish. 

 Wet ground. July. Annual. 



POLYGONUM ARIFOLIUM. L. Hastate Polygenum,^ 



Stem prickly backward ; leaves hastate; spikes 

 few flowered, flowers distinct, with six stamens and 

 two styles. Midi. 



Stem as in the last. Leaves halberd-shaped, twice as large 

 as the last, thin and tender. The stem terminates with a few 

 separate, pale, reddish flowers. Found in a marshy spot near 

 Sweet Auburn, Cambridge. June, July. Annual. 



POLYGONUM CONVOLVULUS. L. Black bindweed. 



Leaves heart-arrow shaped ; stem twining, an- 

 gular : segments of the calyx bluntly keeled. Sm. 



