— 23 — 



pink (C. xanthorrhiza) red-purple (C. aeruginosa and C. phaeocaulis.) The 

 dorsal one is cucullate and ends in a hollow hairy point, rarely (as in 

 C. aurantiaca), the flower is externally more or less hairy. 



The labellum (see PI. II fig. 3 and 11) an -obovate or orbicular disc 

 consisting of a straight somewhat thickened middle bar ending in the dilated 

 and bifid endlobe which is more or less protruding and often decurved and 

 of the semi orbicular sidelobes upcurved so as to form a wide channel. 



The outline of the lip is generally quite entire but if it is flattened 

 artificially there appears a fanshaped wrinkle on each side of the top, as 

 a consequence of the upcurling of the sideparts; sometimes however there 

 is an emargination on each side of the top or median lobe separating it 

 from the sidelobes. In C. aurantiaca this midlobe is much broader than in 

 the other species and of a semi-orbicular outline. Here it stands straight 

 out in the living plant, instead of being curved down as in most species. 

 In C. petiolaia it is also rather broad and has a triangular outline but it is 

 decurved in the living flower. The sidelobes are (when flattened) semiorbi- 

 cular; downwards they form another flabelliform wrinkle on either side 

 whereby they are separated from the lower part, which appears as a broad 

 and very short stalk or claw. The mid-lobe has in the flattened lip a bifid 

 tip of which the lobules sometimes are overlapping, and is traversed in the 

 middle from top to bottom by a longitudinally veined band of a firmer 

 structure and an orange-yellow or yellow colour (156-176), in all the species 

 known to me, while the lip for the rest is pale-orange, white or cream- 

 coloured. The mid-band is narrower than the mid-lobe and is traversed by 

 a number of straight vascular bundles of which mostly 6 are more con- 

 spicuous with an odd one between them which is divided about the middle 

 of the lip into two or more slender branchlets, which spread at the top 

 in the end-lobe. Downwards these fascicles bend outwards forming the lower 

 limit of the sidelobes and continue to the base of the throat. On both sides 

 the central bar is limited by a broad border of papillae, and in very young buds 

 of C. xanthorhiza there is to be seen an elevated line, on either side, which 

 reminds of the wings observed by Gagnepain in C. alismatifolia. The side- 

 lobes are traversed to the edge by a greater number of outward curved lines. 



The labellum represents in the flower-diagram a combination of the 

 two foremost stamina of the interior whorl, (of which only one, the back- 

 stamen, persists as such) with one stamen of the outer whorl of which the 

 two staminodes represent very clearly the two dorsal ones. 



For the rest there are still 3 suppositions possible: 



A. The inner or petalar staminodes are abortive and the labellum in 

 its entirety represents the whole outer staminode (K. Schumann). 



B. The middle-part of the labellum represents the outer staminode, 

 the side-lobes represent the two inner- or petalar staminodes. 



