CHAP. III.] POME^. 69 



is tubular, and five-cleft. There are three 

 styles, as shown at c ; and the stamens (cf), which 

 project far beyond the petals, are inserted in 

 the disk. The fruit (e) is a pome with three 

 seeds (/) enclosed in a cartilaginous membrane, 

 like the core of the apple or pear. The leaves 

 of the Mountain Ash are impari-pinnate, that 

 is, they consist of several pairs of leaflets, ter- 

 minating in an odd one; and the flowers are 

 produced in corymbs. The White Beam-tree 

 {Pyrus Aria), the wild Service (P. torminalis), 

 and several similar trees, belong to this division 

 and have the same kind of fruit as the Moun- 

 tain Ash. The true Service, however, differs in 

 its fruit being generally shaped like a pear, 

 though there is a variety with apple-shaped 

 fruit. One species {P. pinnaiijidd) has the 

 leaves lobed to the midrib, instead of being cut 

 into leaflets ; and this gives the name to the 

 species, leaves of this description being called 

 pinnatifid. The leaves of the genus Pyrus 

 often have their petioles dilated and somewhat 

 stem-clasping at the base ; but they have gene- 

 rally only small stipules. 



Among the other plants included in the genus 

 Pyrus, may be mentioned the beautiful shrub 

 now called Pyrus arhutifolia, which has been 

 successively included in the genera Crataegus, 

 Aronia, and Mespilus; and P. Chamcemespihis, 



