ON THE PROTECTION OF BUDS 93 



and wings clogged by the sticky secretion, and the 

 scent or taste would act as a deterrent to browsing 

 animals. 



Glandular Hairs 



Glandular hairs sometimes take the form of papillae, 

 and are in many species club-shaped, or resemble large- 

 headed pins ; they are often richly coloured, as, for 

 instance, in some of the Currants, Geraniums, &c., 

 glittering in sunlight like emeralds or rubies. They 

 often develop very early, showing that they are in- 

 tended to protect the young and tender leaves. In such 

 cases they soon wither away ; in others, however, they 

 persist as long as the leaf, especially in hot arid dry 

 countries, which are particularly rich in aromatic 

 plants. 



Pleasant as is their smell that, for instance, of the 

 Lavender such plants are too astringent to be eaten, 

 and are thus protected from browsing quadrupeds. 



The secretion may be either a gum, which, for 

 instance, is richly secreted in the buds of some species of 

 Polygonum ; or a resin ; or both may be present together. 

 The resin, according to Hanstein (15), is generally 

 secreted in the interior of the cells, and oozes through 

 the cell wall, while the mucus is generally the product 

 of the epidermis. The properties and functions of the 

 two are no doubt different. Some plants secrete both, 

 as, for instance, the Horse Chestnut. 



