178 ROSACES. 



terminating abruptly, with the ends of the bony cells 

 exposed. (Name from the Greek mespile, a medlar.) 



1 8. CRAT^EGUS (Hawthorn) . Calyx 5-cleft, divisions 

 acute ; petals 5 ; styles 1 5 ; fruit oval, or round, con- 

 cealing the ends of the bony cells. (Name from the 

 Greek cratos, strength, in allusion to the hardness of 

 the wood.) 



PRUNUS SPINOSA (Sloe, or Blackthorn) . 



1. PRUNUS (Plum and Cherry). 



* Fruit covered with bloom; young leaf with the halves 

 rolled together. 



1. P. communis (Sloe, or Blackthorn ; Bullace and 

 Plum). Flowers solitary or in pairs. Under this name 



