556 



EUPHORBIACE.E. 





PERENNIS (Dog's Mercury). 



among the upper ones grow the small, green flowers, 

 the barren on long stalks, the fertile sessile. Fl. 

 April, May. Perennial. 



2. M. annua (Annual Mercury). Annual ; stem 

 branched ; leaves sessile, smooth. Waste places ; not 

 common. Taller than the last, and branched. The 

 leaves are smaller and of a light green hue. Barren 

 and fertile flowers are sometimes found on the same 

 plant. Fl. August. Annual. 



3. Buxus (Box). 



1. B. sempermrens (Common Box-tree). A small 

 tree growing in great abundance, and apparently wild, 



