MOEPHOLOGT OF EEPEODUCTIVE ORGANS 205 



nnited, and from which they separate when the fruit is ripe. This 

 prolongation of the thalamus is termed a carpophore. 



When the styles of a synoarpous pistil are distinct, they 

 usually correspond to the number of carpels of which that pistil 

 is composed. It sometimes happens, however, that the style of 

 each carpel bifurcates or becomes forked, as in some Euphor- 

 biacese, either once {figs. 430 and 445), or twice {fii^. 444) ; in 

 which case the apparent number of the styles is double or 

 quadruple that of the carpels. 



Form and Surface of the Style. — In form the style is gene- 

 rally more or less cylindrical ; either tapering from the base to 



Fig. 447 



Fig. 448. 



Fif/. 446. Pistil of a species of Iris. o. Ovary, sli/. Petaloid styles, stir/. 



Stigmas. J^iff. 447. Upper part of the style and stigma of Leschenaultia 



formosa. i. Style, s. Stigma. Ficf. 448. Upper part of the style, t, of 



a Composite plaut, dividing into two branches, which are covered above by 

 collecting liairs, pc. 



the apex, as is generally the case, or becoming enlarged as it pro- 

 ceeds upwards. In other cases the style is filiform, or more or less 

 thickened, or angular ; and rarely thin, coloured, and flattened 

 like a petal, as in the species of Carina and Iris {fig. 446), 

 when it is said to he petaloid. 



' The surface of the style may be either smooth, or covered in 

 various ,ways with hairs. These hairs when situated on the 

 style frequently serve the purpose of collecting the pollen, and 

 are hence termed collecting hairs. The coUeoting hairs on 

 the style of the species of Campanula are retractile. In the 



