192 CERASTIUM ARVENSE. FIELD MOUSE-EAR CHICKWEED. 



Our Cerastium arvense varies considerably, and hence several 

 forms, which, with our present knowledge of the range of varia- 

 tion, are considered as nothing but varieties, have been described 

 as separate species. Those students, therefore, who desire to 

 look up the history of our plant will have to search for it under 

 several names. Mr. Watson, in his " Bibliography," says that 

 the C. elongatiim and C. tcmiifolium of Pursh, as well as the C. 

 Poinsylvanicum of De Candolle's " Prodromus," are all identical 

 with the Cerastium arvense. De Candolle's species was founded 

 on the narrower petals and the more rounded capsules of a form 

 found in the state of Pennsylvania. 



The Field Mouse-Ear Chickweed can be readily propagated 

 for garden purposes by dividing the creeping root-stock. 



