XXII. 



POLYGONUM HYDROPIPER. 

 Biting Persicaria, Arsmart, or Water-Pepper. 



ClassWW. OcTANDRiA. — Order 1. Trigynia. 



Nat. Ord. Polygone^. 



Gen. Char. See Bistort. 



Spec. Char. Flowers hexandrous, half-digynous. Leaves 

 lanceolate, waved, not spotted. Spikes filiform, droop- 

 ing. Stem erect. 



SYNONYM ES. 



/ Persicaria urens, seu Hydropiper. Bauh. Pin. 101. 

 Latin -| Persicaria acris, sive Hydropiper. Rail Syn. 144. 



(.Polygonum Hydropiper. Lin. Sp. Pl.blT. 

 French .... Persicaire brulante : Poivre d'eau ; Curage. 

 Italian .... Pepe aquatico. 

 Spanish .... Pimienta de agua. 

 Portuguese. Pimenta de agua. 

 German • . . Wasserpfeffer ; Bitternknceterich. 

 Dutch .... \^''ater-peper. 

 Danish. . . . Vand peber. 

 Swedish .... Bitterblad. 



Polish Pieprz wodiiy. 



Russ Potschednaja trawa. 



Description. — The root is annual, aquatic, fibrous. The 

 stems are smooth, cylindrical, articulated, nearly erect, often 

 branched, tinged with red, and about two feet in height. The 

 leaves are simple, alternate, smooth, shortly petiolate, lanceolate, 

 acute, wavy, free from spots, and furnished at the base with 

 short truncated stipules of a reddish hue. The flowers are dis- 



