so 



COLLEGE BOTANY 



as guttation (see page 178). Some leaves are very smooth, while 

 others develop more or less hair-like growths called plant-hairs 



FIG. 62. (a) Gland hair; (6) gland on leaf; (c) gland in orange peel; (d) gland cavity in 

 pine needle; (e) flower of nasturtium showing nectar gland spur. 



or trichomes (Fig. 61). They correspond to the root -hairs of 

 the roots but present a much greater variety of forms. 



