ranged and more of the nature of short ridges than of low raised promin- 

 ences as in the former species. The shape too is rather more angular, and 

 they are not much more than half the size. 



The Field Chickweed, Cerastiuvi arvense, L., is in some places a trouble- 

 some and persistent weed. A native form occurs abundantly throughout 

 the western prairies, but gives little trouble. In some parts of Ontario, 

 Quebec and the Maritime Provinces there is a form with smoother leaves, 

 which produces a copious system of underground rootstocks, which enables 

 this plant to become a persistent enemy. Pastures or meadows invaded by 

 it must be broken up and cleaned by a short rotation. The flowers of the 

 Field Chickweed are large and conspicuous, more than i inch across, and 

 borne on erect flowering stems 3 to 6 inches high. In the West the plant 

 is sometimes grown as a garden flower for its beauty. The seed is larger 

 than those of the preceding Chickweeds, almost round and coarsely tuber- 

 culate, with rounded prominences. 



38 



