WHITE BEAM 



40s 



What parts of the flower are still present in a ripe ' hip. ' 

 Ex. 213. — Examine the structure of a double garden rose and compare it 

 with that of a wild one. 



9. Genus Pyrus. To this genus belong the Pear (Pyrtis 

 communis L.), Apple {Pyrus Malus L.), Medlar {Pyrus ger- 

 manica Hook.), and several other species, such as Mountain Ash 

 {Pyrus Aucuparia Gaert.), Wild Service {Pyrus torminalis 

 Ehrh.), and White Beam {Pyrus Aria Sm.). 



Fig. 126. — A^ Vertical and transverse section of a' 

 pear flower. 71 Sepal ; a. ' calyx-tube ' of the recep- 

 tacle ; r lower part of the receptacle ; c carpels im- 

 bedded in r; ^ovules; 3petal; j stamen ; ;^ sty le. 



Bf Pome developed from the flower A . 



The flower and fruit of the pear, illustrated in Fig. 126, may 

 be taken as an example of the genus. 



The receptacle of the flower is hollowed out, and the gynsecium, 

 consisting of five carpels, is sunk in the hollow space. 



In the plum {cf. Fig. 124) and rose, which also have similarly 

 hollowed receptacles, the carpels are free from the sides of the 



