MORPHOLOGY OF ORCHID FLOWERS. 



21 



lahellum in its simplest form and similar to the petals ; in Coryanthos 

 and Stanliopea on the other hand it is of very complex structure. In 

 many iNfasdevallias it is concealed within the se]ialine tuhe, and in many 

 other species hoth of tliat and allied f^enera it is an inconspicuous jinvt 



Simvred labfllum of Cnmparettia Macroplectrnn. 



of the flower, while in many Oncids, and especially in Miltonia, as M. 

 vexillaria, M. Roezlii and others, it is dilated into a, blade as larcje as, or 

 larger than all the other segments taken together. In many genera it is 

 prolonged into a slender spur, which in Anr/ireciwi sesqidimlale 



Acrides suavissiimim. 

 With ram's horn-like labellum. 



A. ElUsii, A. randatum and others attains an inordinate length ; 

 ill other genera the spur is more open and takes the form of a 

 funnel, as in Vanila fcre^, Dendrohiuiii fonnosum, D. longicornu, or 

 of curved horn-like shape as in Aerides. Other remarkable forms of 



