116 



NEOTTE^. 



Chai-. IV. 



couvex in front and concave behind, with its sharp 

 summit slightly hollowed out on each side ; it arches 

 over the stigmatic surface (fig. 18, A, r, s). Internally, 



Fig. 18. 



LiSTEKA OVATA, or Tway-blade. (Partly copied from Hooker.) 



col. 



summit of column. 



Anther. 



pollen. 



rostellum. 



stigma. 



labellum. 



nectar-secreting furrow. 



Flower ricwed laterally, with 

 all the sepals and petals, except 

 the labellum, remoTed. 

 Ditto, with the poUinia re- 

 moved, and with the rostellnm 

 bent down after the ejection 

 of the viscid matter. 



