CARNIVOROUS PLANTS WITH ADHESIVE APPARATUS. 



155 



otherwise interested in the vegetable world are impressed by the sight of a plant 

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

 were limed twigs. In the neighbourhood of Oporto, where Drosophyllu'm grows 

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



Fig 30 — Ihe Flj-catchei {U/usophyllum lusitanicum) 



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

 fchem 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-viridis, S. 

 hulhifera, S. tridactylites, Sempervivum montanum), secondly, caryophyllaceous 



