BUCKWHEAT FAMILY. Polygonaces. 



Knot rass A slender 8 P ecies with a weak stem, 



i'oii/!/<>nnni bluish green, small lance-shaped leaves, 



nricuinre scaly joints, and greenish pink-tipped 



Greenish flowers. Common everywhere in culti- 



yellow vated and waste ground. The blue-green 



September leaves, alternate, or are in appearance 

 clustered, and issue from tiny brown 

 sheaths. 



Erect Knot- A stouter and a yellowish green stem, 



weed leafy ; the leaves nearly oval, and the 



"oli/y<mum flowers greenish yellow. A common way - 



QreenUh side weed north of Tenn. and Ark., east 



yellow and west. The stem of this species is 



July noticeably erect with no tendency to 



September spraw l. 



Pennsylvania A somewhat red-jointed species, at home 

 Persicaria i n wet waste places, with shiny lance- 

 Polygonnm shaped leaves, and pink or white-green 

 Pcnnsylvnnicum , , . 



Pink or white- fl wer - c l u sters; the upper branching steins 

 green and flower-stems beset with tiny hairlike 



July glands. Common everywhere. It has a 



September branching, sprawling habit. 

 Lady's Thumb ^ smooth-stemmed species, from the old 

 I'olygonum world, with similar leaves and crimson- 

 I'lTsicuria pink or deep magenta flowers, the leaves 

 Crimson-pink rougn an( j generally marked with a darker 

 September S reen triangle in the middle. Very com- 

 mon in waste damp places. 

 A common weed in all wet waste places, 



WateTpepper indi S enous in the far northwest, but 

 naturalized from Europe in the east. 



Hydropiper Leaves narrow lance-shaped, very acrid 



Green an( j pungent, and fringed with tiny 



bristles. Flowers mostly green in a slim 



long cluster, nodding. _ An annual 1-2 feet 



high. The indigenous species P. hydropiperoidcs with 



an equally wide distribution has pink or flesh-colored or 



greenish flowers, branching stems, and very narrow 



leaves, not acrid. Common south, and reported in Neb. 



(Webber). 



,06 



