POLYPETAL^— ROSACEA 



143 



fruits are distributed by birds in the same manner as in the 

 175 176 



Fig. 175. — Vertical section of compound fruit of Blackberry : 

 j^ = sepals ; j/=shrivelled stamens; (/=drupes. 



Fig. 176. — Vertical^ section of a single drupe of ditto : end 

 =stony layer of pericarp; ^j= testa of the seed ; coi=CQ\.y- 

 ledons. 



Strawberry, but the stony endocarps (fig. 176, end) protect the 

 seeds. 



Types IV. : CHERRY, PLUM, and APRICOT {Prunus). 



Prunus (including 

 flowers (fig. 177) 

 constructed on the 

 same plan as those 

 of the Rose; but 

 there is only one 

 carpel, containing 

 two ovules, at the 

 bottom of the deep 

 receptacular tube 

 (re) of each flower. 

 After pollination 

 great differences in 

 the behaviour of 

 Prunus and of the 

 Rose set in. The 

 receptacle-tube of 

 Prunus drops off, 

 and the single 

 carpel grows greatly 



the Cherry, Plums, and Apricot) has 



Fig. 177. — Vertical section of flower of Cherry. 



and becomes a one-seeded stone-fruit 



