LECT. IX.] LEAVES. 503 



or vesicular (papillosa), when they are evidently 

 elevations of the cuticle filled with aqueous fluid, as 

 in the Ice plant, Mesembryanthemumtr^frz/Kmtm. 

 If the surface of a leaf be studded with short her- 

 baceous spines, it is termed muricated (muri- 

 cata); when these have stiff points, it is prickly 

 (echinata) ; and aculeated (aculeate), when., in- 

 stead of being herbaceous, the spines are hard 

 and pungent. The surface is termed hispid (his- 

 pidajy when it is beset with short stiff hairs ; when 

 these are longer, and consequently less rigid, it is 

 hirsute (hlrsuta) ; bristly (setosa), 59, if they stand 



2. 



singly and resemble bristles ; strigose (strigosa), if 

 they are firm, and stand upon small prominences, 

 or papillae* : and bearded (barbata), when they 

 are rather long and crowded together. Soft hairs 

 are generally termed pubescence, and the surface 

 of the leaf receives various appellations from the 



* " Strigae arcent setis rigidis animalcula et linguas. Cae- 

 " tus, Malpighia, Hibiscus, Rubus." Phil. Bot. 163. 



K K 4 



