68 



POME^. 



[part I. 



as in the Apple. This distinction, and some others, 

 have been thought, by some botanists, sufficient 

 to constitute the Apple and its allied species into 

 a separate genus under the name of Mains. 

 The leaves of the Pear differ from those of the 

 Apple in being the same colour on both surfaces, 

 whereas those of the Apple are covered with 

 a white down on the under side. 



Besides the Apple and the Pear, and their 

 respective allies, which form two distinct 

 sections of the genus Pyrus, that genus, 

 being a very extensive one, is divided into 

 several other sections, all the plants contained 

 in which may be arranged under two heads : 

 viz., those that formerly constituted the genus 

 Sorbus ; and those that were once called Aronia. 

 The Mountain Ash {Pyrus aucvparia) may 

 be considered as a fair specimen of most of the 

 trees belonging to the Sorbus division. By 

 the details of the flowers of this species given 

 in Jig. 29, it will be seen that the petals {a) 



Fig. 29. — Flower and fruit of the Mountain Ash. 



are very small and concave ; and the calyx (h) 



