Chap. II. 



HABENARIA CnLORANTHA. 



69 



of the pollinia by insects, including the moYement of 

 depression, are as perfect as in the species which 

 depend upon insect aid." Hence there can be little 

 doubt that this species is occasionally cross-fertilised. 



Habenaria CHLORAirrnA, or Butterfly Orchis. 



a a, anther-cells. 



d. disc of pollinium. 



8. stigma. 



n. nectary. 



n'. orifice of nectary. 



/. labellura. 



A. Flower viewed in front, with all 

 the sepals and petals removed 

 except the labellum with its 

 nectary, which is turned to one 

 side. 



B. A pollinium. (This has hardly 



a sufficiently elongated appear- 

 ance.) The drum-like pedicel 

 is hidden behind the disc. 



C. Diagram, giving a section 



through the viscid disc, the 

 drum-like pedicel, and the 

 attached end of the caudicle. 

 The viscid disc is formed of an 

 upper membrane with a layer 

 of viscid matter beneath. 



Habenaria or PJafanthera clilorantlia, — The pollinia 

 of the Large Butterfly Orchis differ considerably from 

 those of any species hitherto mentioned. The two 



