GREEN GROUP 



narrower, acute. Calyx wings spiny-toothed; achenes smooth, 

 red. 



Smaller Green Dock 



R. conglomerates has a leafy panicle of pedicelled, small flow- 

 ers. Leaves petioled, oblong to lance-shaped, acute, i to 5 inches 

 long. 



Golden Dock 



R. persicarioides. — The flowers of this species are densely 

 whorled in a long panicle. The valves have 2 or 3 pointed, long 

 bristles on each side. The "grain" becomes golden in color. 

 Stem stout, 1 to 3 feet high, sometimes creeping, very leafy. A 

 maritime plant, found also in the interior. 



Xnotweed. Doorweed 



Polygonum aviculkre. — -Family, Buckwheat. Leaves, small, 

 sessile, blue-green, less than 1 inch long, narrow. Sheaths silvers-, 

 membranous. Corolla, none. Calyx, green, bordered with pink. 

 Flowers, very small, in axillary clusters. Summer. 



There is a puzzling variety among the species of this genus, 

 some of which are common weeds; others, rarer, aspire to 

 prettiness. Many of them frequent wet places and are found 

 along roadsides. This one is smooth, much jointed, pros- 

 trate, slender. Very common. 



Erect Knotweed 



P. erectum is stouter, erect, 2 feet or less tall, with broader 

 leaves. There is a yellowish tint to the flowers and stem by which 

 it may be known. Flowers, 1 or 2 in the leaf axils. Leaves jointed 

 to the sheaths, which are the distinguishing mark of the buck- 

 wheat family. 



This and the preceding are quite common weeds. 



Common Smartweed. Water Pepper 

 P. hydropiper. — Of rather low growth, with smooth, dotted, 

 narrow leaves very peppery to the taste. Flowers, in dense, nod- 

 ding spikes, with numerous small bracts. The sheaths are fringed 

 along their edges. Stamens, 6. Summer. 



8 inches to 2 feet high. Wet grounds. 



P. <virginianum. — Corolla, none. Calyx, 4-parted, the divisions 

 unequal. Stamens 5, styles 2. Flowers, in long, loose spikes, 1 \o 

 3 from a single bract. Stem, smooth, 2 to 4 feet high. 



Perennials. Found in thickets or moist woods. 



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