— 28 - 



back. Here the thecae are reflexed and in the angle-point the mucilaginous wall 

 forms a viscouscorpuscle in function similar to the retinaculum of the Orchids. 



The back of the insect entering into the flower touches this most 

 projecting point of the anther. When the insect comes out again it pulls 

 the short lever arm up and the upper part of the anther constituting the 

 longer arm removes gradually from its back; but with this the whole pollen 

 mass (see PI. Ill f. 29) gets loose from the thecae as a coherent strip from below 

 to above, and remains erect on the back of the insect. The (see fig.) whole 

 process is thus just the contrary as in Eucurcuma. While in the latter the 

 retiring of the anther is mechanic, and the insect looses the pollen strip 

 from above to below; in C. aiirantiaca the anther is pulled backward by 

 the retiring of the insect itself and and in the same time the pollen is 

 loosed from below to above. 



As in so many respects C. petiolata is here again intermediate betvveen 

 Eucurcuma and C. aurantiaca, but nearer to the latter. As in C. aurantiaca 

 the anther is attached near its base and is nearly erect, the short spurs are 

 of little use to block the entrance. Besides, as has been said, the loculi are 

 recurved at the base, as in C. aurantiaca, and continue over the lower edge 

 which is at the same time base of the spur. 



Evidently the construction is nearer to that of C. aurantiaca and the 

 pollen gets loose also from below to above. The lower part of the thecae, 

 however, though poUiniferous is very narrow, and may easily be overlooked, 



A similar structure is also to be seen in C. Heyneana, V. et v. Z. (see below) 

 where the little cap of the connective protrude a little farther and the 

 spurs are less deeply grooved. A beginning of a continuation of the thecae 

 in the spurs is also found in C. aeruginosa but here it does not contain 

 pollen. In the latter species, however, the pollination is just as in Eucur- 

 cuma. I never saw living flowers of C. Heyneana and cannot tell how the 

 pollination takes place. 



§ 5. Key to the determination of the species. 



1. Tubers in groups, without elongated rhizomes. Leaves rounded 

 at the base. Anthers not or shortly calcarate. Staminodes not 

 folded. Liguialobes auriculate. 



A. Anthers ecalcarate: C. aurantiaca. 



B. Anthers shortly calcarate; loculi of the anthers continuous over the 



a. flowers orange; bracts of the coma quite dark-purple-brown, iloral- 



b. flowers light-yellow; bracts of the toma pink. 



a', spurs of the anthers curved, floral-bracts obtuse: C. australasiaca. 

 b'. spurs of the anthers straight,- cells continuous along the whole 

 face of the spurs. 



base of the spur. 



bracts also dark-purple-brown at thê top: 



C. petiolata. 



