DIV. II 



SPERMATOPHYTA 



557 



of the insects or themselves in search of nectar, get dusted with pollen from the 

 flowers, which face downwards, and carry it to other flowers. On the investiga- 



FIG. 529. Ornithophilous flower of Strelitzia reainae and a cross-section of its large labellum (p); 

 t outer, and p inner perianth leaves ; g, style and stigma ; st, stamens. (From SCHIMPER, Plant 

 Geography.) 



tions of HESS referred to above, it is easy to understand why the majority of 

 ornithophilous flowers (Aloe, Clianthus, epiphytic Loranthaceae, etc.) are red, since 

 this colour has the same value to the eyes of day-flying birds as to our own. 



Besides these ORNITHOPHILOUS plants there are a few visited by Bats 



