92 TYPICAL FLOWERS OF ALPINE PASTURES 



If we examine the young flower-buds, we shall 

 find that the petals are all united into a closed tube 

 (Text-fig. X., 1). At a later stage the petals begin to 

 split apart at the base and the style pushes through 

 the tip of the still united upper portions (Text-fig. X., 

 2 and 3). Finally, the petals separate altogether and 



c. 



-k. 



FIG. X. The Flowers of the Round-headed Rampion (Phyteuma 

 orbiculare, Linn.), in various stages. Magnified. 



k calyx; c corolla; a = anther; s= style; 6 = stigma. 



1. The united petals of a young flower, with the calyx below. 



2. The petals separating in an older flower. 



3. The petals further separated, and the style growing through the tip of the 



tube formed by the petals. 



4. Mature flower with free petals, showing the style with stylar brush, and 



the three expanded stigmas. 



curl apart, leaving the style fully exposed (Text-fig. 

 X., 4). The same mechanism of the stylar brush 

 exists here as in Campanula (p. 85). The Eampions, 

 however, differ from the Bell-flowers in the mature 

 petals being quite free from one another, though 

 they are slightly united when young. 



