OCTANDRIA.— TRIGYNIA. 171 



TRIGYNIA. 



277, POLYGONUM. Persicaria, &c. Polygon**. 

 * Flowers axillary. 



1. P. aviculare : stamens 8, styles 3, leaves lanceolate, 



scabrous on the margin ; nerves of the stipules dis- 

 tant ; stem procumbent, herbaceous. 

 HAB. Fields, &c. May— Oct. 0. Much bran. ; 

 Jl. very small, wh. or reddish : seed striate. 



2. P. glaucum: flowers octandrous ; styles 3; leaves 



lanceolate, thick and glaucous, revolute on the 

 margin ; stipules lacerate ; pedicels exserted ; stem 

 diffuse, procumbent ; seed acutely angular, smooth 

 and shining. 

 HAB. Sandy sea-shore. Aug. © ? Stem long, sub- 

 lig. ; Jl. larger than No. 1, rose-col. 



3. P. tenue: stem slender, erect, branched, acutely 



angular ; flowers alternate, subsolitary ; leaves 

 linear, acuminate, straight ; stipules tubular, lace- 

 rate, with the segments finely attenuate at the ex- 

 tremity. 

 HAB. Rocks and sandy fields. July — Sept. 0. 

 Stem 6 — 10 in. high; ang. scab. 



** Flowers spiked. 



f. Spike solitary, terminal; stamens ; stigmas 3, nut tri- 

 angular. BlSTORTA.. 



4. P. viviparum : stem simple ; spike linear,- solitary : 

 leaves linear-lanceolate, revolute on the margin ; 

 the lower ones elliptical, petiolate. 

 HAB. High mountains. Aug. U. Stem 6 — 8 in. 

 high; slip, tub., smooth ; Jl. red. 



\] Spikes axillary or terminal; stamens 5 — 8; stigmas 

 mostly 2 ; nut ovate. Peksicari \. 



'). P. punctatum: flowers octandrous", glandular-punc- 

 tate ; styles 3-parted ; stipules slightly hairy, cili- 

 ate ; spike filiform, at first cernueus ; leaves lan- 

 ceolate, with pellucid punctures, scabrous on the 

 margin and ruulrib. 



