78 



SEEDS AND FRUITS 



Plum or Stone Type. The Plum, Peach, Cherry, and Apri- 

 cot, commonly called drupes, are fleshy ovaries, but differ from 



s B 



FIG. 77. Section through flower and fruit of the Apple. A, section 

 through the flower, a, receptacle; 6, ovaries; d, ovules; t, floral organs, 

 calyx, corolla, stamens, styles and stigmas. B, section through the fruit. 

 a, receptacle; c, core; s, seeds; r, remains of floral parts; Z, the flesh around 

 the core, bounded on the outside by the conductive vessels, indicated by the 

 lines. The inner portion of this band of flesh is the outer portion of the ovaries, 

 the remainder of it being the inner portion of the receptacle. 



the berry type in that the portion of the ovary immediately sur- 

 rounding the locule hardens into the stone or pit. In Figure 76, 

 point out the seed, the pit, and the fleshy 

 portion of the ovary. 



Apple or Pome Type. The Apple, 

 Pear, and Quince are examples of pome 

 fruits, and their structure can best be un- 

 derstood by studying Figure 77. The 

 receptacle of the flower is not flat as it 

 is in many flowers, but is hollow or urn- 

 shaped; and the five ovaries are located 

 in the hollow of the receptacle and are 

 grown fast to its sides. The calyx, petals, 

 and stamens are located on the rim of 

 the receptacle and thus above the ova- 

 ries. As the fruit develops, the receptacle 

 surrounding the ovaries thickens and 

 forms the greater part of the fruit, while the ovaries form the 

 portion known as the core. 



FIG. 78. Cross section 

 of a Cucumber, r, rind 

 consisting of receptacle 

 and ovary wall closely 

 joined; I, locules; p, pla- 

 centas; s, seeds. 



