91 



of the leaf. They are, however, equally appUcable to the sur- 

 face of any othei^rgans. (41, a.) 



1. G^a6?-oits, smoof A ; denoting the absence of all haii-s oi* bristles. Hydrangea. 



2. Pubescent^ covered with soft hairs or down. LoniceraXylosteum. 1 



3. Rough, y/iih hard, short, even points.' Borago officinalis. 



4. Pi7osc, -with short, weak, tliin haks. , Prunella vulgaris. 



5. Hoary, 'white, with very short, dense hairs.) Gnaphalium. 



6. Villose, with long, tliin hahs.:. Solidago altissima. 



7. Woolly, Svith long, dense, matted haii-s. MuUem.; 



8. Tomeritose, with dense, short, and rather rigid hairs, r Spirea tomentosa. 



9. Rugose, the tissue between the reticulated veins convex, from its superabun- 

 dance. Sage. 



10. Pmutatc, dotted with pellucid glands (44, a) 



Hypericum punctatum. 



§S. COMPOUND LEAVES. 



FIG. 32. — Compound leaves, 4, Trifoliate loaves ; a, i»iiinately, as of the bean; i, pal- 

 mately, clover 



238. When a simple leaf becomes a corilpound one, the divis- 

 ion takes place upon the same principle as the separation of an 

 enthe leaf mto segments, lobes, and teeth, namely, from a defi- 

 ciency of parenchyma; the number and arrangement of the 

 leaflets wall therefore, in like manner, depend upon the mode of 

 veining. 



239. Tlie divisions of a compound leaf are called leaflets, 

 and the same distmctions of outUne, margin, &c., occm- in them 

 as in simple leaves. , In the truly compoimd leaf, each leaflet 



