THE CARPEL AND OVULE 



253 



transverse seetion shows by its outline, by tlic arran^u-inent of tlir 

 vascular strands, and by the position of the ovules that the compound 



ff 



Fig. 198. 

 Whole gynoecium of Caltha, 

 consisting of many carpels, all 

 separate. 



Fig. 199. 

 Pistil, or gynoecium of Lily, show- 

 ing the relative positions of ovary, 

 style, and stigma. I". O. B. 



structure is referable in origin to three fused leaves (Fig. 201). More- 

 over cases of partial fusion are found, for instance in Colchicnm, where 

 the three carpels are fused below, but extend upwards as separate 



Fig. 200. 

 Transverse section through the separate 

 carpels, composing the gynoecium of 

 Caltha. F. O.B. 



Fig. zoi. 

 Transverse section of ihc ssn. .ui-..- 

 ovary of Lily, showing the three kiUl«'«l 

 carpellary leaves, bearing ovule<i on 

 their margins. 1'. O. H. 



Styles. Their relative positions are, however, the same as of those 

 in the completely syncarpous Lily. Biologically the advantage of a 



