NOMENCLATURE OF THE LEAF. 67 



y. Hirsute when these are larger, and consequently, less rigid. 

 z. Bristly if they stand singly, and resemble bristles, 

 a a. Strigose if they are firm, and stand upon small prominences 

 r papillae, 

 b b. Bearded when they are rather long and crowded together. 



20. Pubescence: Soft hairs are generally termed 

 pubescence, and the surface of the leaf receives the 

 following appellations from the character of this de- 

 scription of covering: hairy, shaggy, silky, downy, 

 woolly, tufted, and starred. 



a. Hairy when the hairs are soft, distinct, somewhat long, 

 and bent. 



b. Shaggy when they are soft, nearly erect, and parallel. 



c. Silky when they are soft, and lie thick and flat on the surface, 

 giving it a satin-like lustre. 



d. Downy when they are very soft, and matted together, so that 

 the individual hairs are not distinguishable. 



e. Woolly when they are also matted, bat individually distin- 

 guishable, as in the woolly hedge-nettle. 



f. Tufted when they are soft and matted, and can be easily 

 detached in small tufts. 



g. Starred when they are radiated like stars. 



21. Glands: The leaves of many plants have a 

 peculiar glandular character common to them, and from 

 the nature of this particular distinction, they are either 

 said to be glandular, dotted, viscid, hoary, or mealy. 



a. Glandular when they are not elevated or on pedicles, as in the 

 white willow and bird cherry-tree. 



b. Dotted when they are not raised, bat appear like punctures, 

 which either penetrate the substance of the leaf, or are merely su- 

 perDcial, and visible on one disk only. 



c. Viscid when there is a glandular secretion, rendering the sur- 

 face of the leaf, moist and tenacious. 



