CARNIVOROUS PLANTS M'lTH ADHESIVE APPARATUS. 



155 



otherwise interested in the vegetable world ai'e impressed by the sight of a plant 

 with its leaves covered with a number of insects adhering to them as though they 

 were lime-twigs. In the neighbourhood of Oporto, where Drosophyllum grows 

 abundantly, the peasants use these plants instead of lime-twigs, hanging them up 



Fig. 30. — The Fly-catcher {Drosophyllum lusitanicum). 



in their rooms, and so getting rid of numbers of troublesome flies which stick to 

 them and are killed. 



A number of other plants have the power, though in a less conspicuous degree 

 than Drosophyllum, of obtaining additional nitrogenous food out of adherent 

 animals by means of secretory and absorptive glands. Such are many species of 

 primulas, saxifrages, and house-leeks, which bury their roots in cracks and crevices 

 of rock (e.g. Primula viscosa, P. villosa, P. hirsuta, Saxifraga luteo-v iridis, S. 

 bulbifera, S. tridactylites, Sempervivum viontanum), secondly, caryophyllaceous 



