THE DICOTYLEDONES 



■TOP" 



I7II 



Fig. 1580. — Distribution of the Hydnoraceae. 



Fig. 1 58 1. — Hydnora 

 africana. Flower 

 in longitudinal 

 section. (After 

 Hutchinson.) 



SARRACENIALES 



The Sarraceniales are a small but interesting order of the Archi- 

 chlamydeae in which the flowers are monoecious, except in Nepenthes, 

 actinomorphic and hypogynous. There is usually a separate calyx and 

 corolla. The gynoecium is tricarpellar\% with parietal or axile placentation 

 and indefinite ovules. The seeds are small and endospermic. 



The plants are small and herbaceous or trailing; they inhabit moist 

 situations and the leaves are modified in various ways for trapping and 

 digesting insects and other small animals. We shall consider later the 

 details of the various trap mechanisms employed (see Volume IV). 



Y 



