2 OSBORN, Staminal Mechanism of Passiflora Caerulea. 



It thus appears that there are two movements of the 

 anthers recognised, and that they occur in the order 

 given : — 



(a) A radial one of the anther (and presumably its 

 filament, for reasons given below) through i8o°. 



(/3) A second of the anther alone, on its filament, of 

 90°, bringing the anther into a tangential plane. 



The flower opens as follows. First, the sepals — which 

 are white on their upper surface— expand, leaving the 



Fig. I. Diagrammatic view of stamen erect before the 

 petals open. The stout filament is seen, and the short 

 narrow connective which is attached to the anther 

 between two projecting knobs of tissue, x 4. 



still closed petals upright in the centre. If the petals be 

 cut open at this stage the stamens are seen to be erect 

 with their anthers introrse. Dehiscence of the anthers 

 occurs shortly before the petals expand. Examined at 

 this time the stamen presents the following features 

 {Fig. I.). The filament has not yet attained its full 

 development, and the cells at the distal end are in a state 



