ORGANS OF REPRODUCTION. 



261 



Fig. 571. 



Fig. 571. Vertical section of tVie flower of the Psony (Pteonia). 

 ds. Dorsal suture of the ovary, vs. Veutral suture. 



turned towards the axis of the plant ; and another, which cor- 

 responds to the midrib of the lamina, is directed towards the 

 floral envelopes or to the circumference of the flower ; the 

 former is called the vetitnxl suture {fig. 671, vs), the latter the 

 dorsal (fig, 571, ds), 



Nature of tJie Carpel. — That the carpel is analogous to the 

 leaf is proved in various ways, some of which will be more 

 particularly mentioned hereafter, when treating of the General 

 Morphology of the Flower; we shall here only allude to the 

 proofs of its nature which are afforded by tracing its develop- 

 ment, and by the appearance it sometimes presents in double or 

 cultivated flowers. Thus in the double flower of the Cherry, 



Fig. 572. Fig. 573. 



Fig. 574 



fVfifs. 572, 573, and 574. Carpellary leaves from the double flowers of the 

 Cherry tree. ?. Lamina, p. Midrib, s. Prolonged portion correspond- 

 ing to the stvle and stigma of a perfectly formed carpel Fiq. 575. 



Carpel from the single flower of the Cherry, o. Ovary, t. Style, a 

 Stigma. 



