ORGANS OF EEPEODrCTION. 



283 



ceeds upwards. At other times the style is filiform, or more or 

 less thickened, or angular ; and rarely thin, coloured, and flat- 

 tened like a petal, as in the species of Canna and Iris {fig. 629), 

 it is then said to be petaloid. 



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

 various ways with glands and hairs. These hairs when situated 

 on the style, frequently serve the purpose of collecting the pollen 

 as it is discharged from the anther, and hence are termed collecting 

 hairs. The collecting hairs on the style of the species oiCampanula 

 (figs. 133 and 134) are retractile; they have been already described 

 under the head of Hairs. In the Compositse, the surface of the 

 style is more or less covered with stiff collecting hairs {fig. 631, 



Fig. 629. 



Fig. 630. 



Fig. 631. 



Fig. 629. Pistil of a species of 7m. o. Ovary. 

 sty. Petaloid styles, sf^g. Stigmas. — Fig. 630. 

 Upper part of the style and stigma of Les- 

 chenaultia formosa. t. Style, s. Stigma, i. 



ludusium. Fig. 631. Upper part of the 



style, f, of a Composite Plant dividing into 

 two branches, which are covered above by 

 collecting hairs, pc. s. True stigma. 



j?c),and as the style is developed later than the stamens, it is at first 

 shorter than these organs, but as growth proceeds, it breaks through 

 the adhering anthers, and thus the hairs on its surface come in 

 contact with the pollen and become covered with it. In allied 

 orders to the Compositse, namely, the Goodeniacese {fig. 630, i) 

 and the Lobeliacese, the hairs form a little ring below the stigma, 

 to which the term of indusium has been given. 



3. The Stigma. — The stigma has been already described as 

 being connected with the placenta by means of the conducting 

 tissue of the style ; hence it may be considered as a portion of 

 the placenta prolonged upwards, but differing from it in not 

 bearing ovules. If this be the proper view of the structure of 

 the stigma, this part, like the placenta, must be regarded as 

 double, one half being formed by each margin of the carpellary 



