20fi 



MANUAL OF BOTANY 



Compositfe the surface of the style is also more or less covered 

 with stiff collecting hairs [fig. 448, pc) ; as the style is developed 

 later than the stamens, it is at iirst shorter than these organs, 

 but as growth proceeds, it pushes itself through the syngenesious 

 anthers, and thus the hairs on its surface come in contact with 

 the pollen and become covered with it. In some of the orders 

 allied to the Compositse, the hairs form a little ring below the 

 stigma (fig. 447, i). 



3. The Stigma. — The stigmas of a sj'nearpovis pistil are 

 generally opposite to the cells, and alternate with the dissepi- 

 ments, but it sometimes happens,- as in the Poppy, that half 



Fig. 449. 



Fig. 4.50. 



Fig. 451. 



^ 



^ 



i\ 



Fig. 449. Pistil of a Lily, with one style and a 



trilobate stigma. 'Fig. 450. Lobed stigma 



of the Melon. Fig. 451. Pistil of a species 



of Chrysan them 11771, with one style and a 

 bifid stigma, the divisions with hairs at 

 their extremities. 



■rr 



the stigma of one carpel unites with a similar half of that ot 

 the adjoining carpel ; the rays thus formed are alternate with the 

 cells, and opposite to the dissepiments, the latter being, however, 

 imperfect {fig. 426). 



We have already seen that the stigma may be separated 

 from the ovary by the style {figs. 395-397) ; or the latter organ 

 may be absent, in which ease the stigma is said to be sessile, 

 as in the Barberry {fig. 398, sfj and Poppy. In Orchids the 

 stigma is sessile on the gynostemium, and appears as a little 

 cup-shaped viscid space just below the attachment of the poUen- 

 masses. 



In a syncarpous pistil the stigmas may be either united 

 together as in the Primrose {fig. 395), or distinct as in Ca/mpa- 



