PIV. 



MORPHOLOGY 



187 



the mechanism exhibited by some exotic insectivorous plants. In 



the case of Venus's fly-trap 



(Dionaea), growing in the 



peat-bogs of North Carolina, 



the capture of insects is 



effected by the sudden closing 



together of the two halves 



of the leaf, which are fringed 



with long bristles. Fig. 217 



shows a leaf of Dionaea in the 



expanded condition, ready for 



the capture of an jnsect. The 



European water-plant Aldro- 



* v i __.-,] FIG. 217. A leaf of Dionaea muscipula, showing the 



has Similarly -formed sens itive bristles on its upper surface, which, in the 

 parts shaded, is also thickly beset with digestive 

 glands. ( x 4. After DARWIN.) 



leaves. 



FIG. 219. Pitchered leaf of a 

 Nepenthes. A portion of the 

 lateral wall of the pitcher 

 has been removed in order to 

 show the digestive fluid (F), 

 excreted by the leaf -glands. 

 FIG. 218. Nepenthes robusta. (nat. size. After SCHEN.K.) ( nat. size. After NOLL.) 



In the case of other well-known insectivorous plants (Nepenthes, 



