36 EXPERIMENT STATION. [Jan. 



Bitter Dock (Rumex ohtusifolium, L.). — The seeds of the 

 bitter dock are very similar to those of curled dock, but are a 

 little narrower at the base. In color they are lighter, more of 

 a grayish brown, and are not so glossy as those of the curled 

 dock. 



Sheep Sokrel {Riimex acetosella, L.). — This seed is 

 shaped like that of buckwheat, but is not nearly so large, meas- 

 uring only about Via of an inch in length. In color the seed 

 is dull reddish bro-wn. Under the hand lens the surface shows 

 rough, being covered with numerous small ridges and projec- 

 tions. 



Dodder (Cuscuta sp.). — The last seed which we shall take 

 up in this article is that most noxious of all weeds, namely 

 dodder. This is a parasite form and chokes out all other growth 

 when well established. The seeds are very small, more or less 

 globular and of a light yellow or buff color. No other seed is 

 likely to be confounded with it, as it is smaller than any of the 

 clovers, and no other resembles it closely. 



It is realized that the foregoing descriptions are meager, but 

 they are as simple and as full as possible without going into 

 the microscopical characteristics of each seed. Only a few of 

 the more commonly occurring weed seeds have been described 

 as lack of space j^revents a description of the numerous others 

 found in commercial products. 



