WEEDS IX THE MEADOW. 233 



to be annoying in meadows or pastures, but the seeds are not 

 unfrequently found mixed with those of grasses and clovers. 



FIG. 122. Polyyonum 

 arirnlare, L., (Knot- 

 grass. Doorweed.) 1 

 + 8.-(Sudworth.) 



FIG. 133. Rumex crispus, L. 

 (Narrow Dock.) Two views. 

 1x11. (Sudworth.) 



FIG. 124. Euphorbia 

 Cwparissias, L. Two 

 views. 1x10. (Sud- 

 worth.) 





FIG. 125. Euphorbia 

 nuiculata, L. (Spot- 

 ted Spurge.) A creep- 

 ing weed. Two views. 

 1 x 15. 



FIG. 126. Urtica di- 

 ofca, L. (Great sting- 

 ing nettle.) This has 

 spread over low land 

 meadows in some pla- 

 ces. 1x15. (Sud- 

 worth.) 



FIG. 127. Brnmussec- 

 alinus, L. i Chess de- 

 prived of glume and 

 palea.) lx3.-(Sud- 

 worth.) 



(Sudworth.) 



Polygonum Persicaria, L. (Lady's Thumb,) and some other 

 species of Polygonum have smooth, black flat seeds. 



Polygonum aviculare, L, (Knot-grass) and some others have 

 triangular seeds, shaped much like small grains of buckwheat. 

 The seeds of these two species, and of others, are often found 

 among grass seeds. 



Rumex crispus, L. (Curled or Narrow Dock) and R. obtusifolius, 

 L. (Bitter Dock) are both common and troublesome weeds in 

 meadows. They are perennial and have long tap roots. The 

 seeds are three angled and like those of Polygonum. 



Rumex Acetosella, L. (Sheep sorrel) is very common on poor, 

 light land. The seed has the shape of the species last-named. 



Euphorbia Cyparizsias, L. (Euphorbia) has escaped from culti- 

 vation. It roots deeply, and has in some places become a great 

 pest. 



Occasionallv seeds of common chess, or cheat, are met with in 



