412 CUT. POLYGONACE/E. 



Order CIIL— POLYGONACE^. 



Tribe I. — Eupolygone^e. 

 Polygonum, Linn. 



Section I. — Avicularia. 



aviculare, Linn. — Wire-grass, Knot-grass, or Hog-weed. 

 Yields a dye like indigo. A vulnerary and astringent 

 herb used to stop bleeding from the nose, &c. (Dymock). 

 The systematic name is said to have been given on 

 account of the seeds being fed to singing-birds. 

 var. erectum, Roth. = P. erectum, Linn. — This principally 

 differs from the normal form in its upright growth and 

 larger leaves. 



plebeium, R. Br. 



Section II. — Amblygonon. 

 orientale. 

 attenuatum, R. Br. (Fig. 394.) 



Section III. — Persicaria. 



prostratum, R. Br. 



hydropiper, Linn.- — " Tang-gul " of Brisbane River natives. 



minus, Hnds. 



subsessile, R. Br. 



barbatum, Linn. — Said to produce a good dark-blue colour. 



(Fig. 395.) 

 articulatum, R. Br. 



lapathi folium, Linn. — Smart- weed of America, 

 lanigerum, R. Br. 



Section II 7 . — Echinocaulon. 

 strigosum, R. Br. 



Section V . — Tiniaria. 



*convolvulus, Linn. — Climbing Buckwheat; a native of Asia, 

 Europe, and Africa. 

 - !c Fagopyrum, Tournef. 



esculentum, Mavicli. — Buckwheat. Often met with as a stray 

 from cultivation. A native of Europe and Northern 

 Asia, and in many countries cultivated as a bread-corn. 



Tribe II. — Rumice^e. 



Pviimex, Linn. — Docks; all bad weeds in cultivation. 



*hymenosepalus, Torrcy. — " Canaigre." A stray from culti- 

 vation, said to contain 20 to 25 per cent, of tannin. 

 S.W. United States and Mexico, 

 crispus, Linn. — Curled Dock. 



