232 



OCTJNDRIA TRIGYNIA. 



220. POLYGONUM. Persicaria, Bistort, Knot- 

 grass, and Buckwheat. 



Linn. Gen. \95. Juss. 82. Fl. Br. 423. Tourn. t.290. Lam.t.3\5. 



Gcertn. t.\\9. 

 Persicaria. Tourn. t. 290. Gcertn. f. 1 19. 

 Bistorta. Tourn. i. 291. 

 Fagopyrum. Tourn. t. 290. Gcertn. t. 119. 



Nat. Orel, hloleracea:. Linn. 12, s. Polygonec^, Juss. 28. 



Cat. inferior, turbinate, more or less coloured, in 5 deep, 

 ovate, obtuse, permanent segments. Cor. none. Filam. 

 various in number, from 5 to 6, 7, or most generally 8, 

 awl-shaped, very short. Anfh. roundish, incumbent. 

 Germ, superior, roundish, either triangular or com- 

 pressed. Styles generally 3, in those with a compressed 

 germen only 2, thread-shaped, very short, in some species 

 partly combined. Stigmas simple. Perk, none, except 

 the closed calyx. Seed solitary, either triangular or com- 

 pressed, pointed ; embryo enveloped in a farinaceous al- 

 bumen. 



Generally herbaceous, v/ith knotty, alternately branching 

 stems. Leaves alternate, simple, revolute in the bud; 

 either sheathing at the base, or attached to an interior, 

 membranous, ribbed, tubular or sheathing, stipula. Fl. 

 axillary, or terminal, simply stalked, clustered, or spiked; 

 either red, or particoloured with red, green and white. 

 Seed brown, often polished. 



* Styles usually bid 2. 



1. P. amphibium. Amphibious Persicaria. 



Styles two, united half way up. Stamens five. Spike ovate. 



P. amphibium. Linn. Sp. PL 5 1 7, Willd. v. 2. 443. FL Br. 423, 

 EngL Bot.v.7.t.43D. Curt. Lond.fasc.4.t.2S. Hook. Scot. \2\. 

 FL Dan. t. 282. 



P. n. 1565. HaU. Hist. v. 2. 261. 



Persicaria salicis folio perennis. Rail Syn. 145. 



Potamogeton salicis folio. Bauh.Pin. 193. 



P. angustifolium. Gar. Em. 821. f. 



P. altera. Dalech. Hist. 1008./. 



P. sive Starhvites. Lob. Xc 30/, /, 



