ir THYMEL.i;ACE.E — EL^AGNACE.E 349 



P. Convolvulus. — This species mucli resembles a 

 Convolvulus in habit. Though the secretion of nectar 

 is slight, the flowers are occasionally visited by bees. 

 The stem is angular. 



THYMEL^ACE^ 



Daphne 



Homogamous flowers with nectar secreted by the 

 base of the ovary. In species which have the corolla- 

 tube short the flowers are fertilised mainly by flies ; 

 when it is longer, by bees ; and the longest, by butter- 

 flies. There are 8 stamens, inserted in the upper part 

 of the corolla-tube. 



We have two species only — D. Mezereum, which is 

 deciduous, with red berries, and D. Laureola (Spurge 

 Laurel), which is evergreen, with black ones. 



D. Mezereum. — The flowers are sweet-scented, well 

 supplied with nectar, and much visited by insects. 

 Ludwig considered the flower to be sterile to its own 

 pollen ; Schulz, however, came to the opposite con- 

 clusion. Perhaps, as Ludwig suggests, this is one of 

 the cases where plants difier in different localities ; or 

 perhaps different plants are differently constituted in 

 this respect. Some of the flowers have no anthers. 



EL^AGNACE^ 

 Dicecious wind flowers. 



HlPPOPH^ 



H. rhamnoides (Sea Buckthorn). — The leaves of this 

 species are the food of a special hawkmoth, the large 

 -caterpillars of which have orange patches curiously 



