THE MONOCOTYLEDOXES 



21 ty 



Fig. 2057. — Maxillaria vemista. A, Flower. B, Column after removal of perianth. C, 



Pollinia and retinaculum. (After Hooker.) 



Fig. 2058. — Vanda bemoni. A, Flower. B, Column with the large anther coveriag above 

 and the attached labellum below. C, Column and labellum in side view. {After Bateman.) 



tainly none which illustrates more closely the interplay between flower and 

 insect in pollination, and a study of the pollination mechanisms in the 

 Orchidaceae brings home, possibly more conclusively than anything else, 

 the belief that these results could only have been produced by the parallel 

 evolution of the flower and the insects which pollinate it. 



With this family we must leave the Monocotyledons and also our account 

 of the families of the Angiospermae. Though much ground has been 



