104,105.] THE COMPOUND LEAF. 123 



be noticed. A sessile leaf is said to be amplexicaul 

 when its base-lobes adhere to and clasp the stem. 

 Should these lobes extend quite around the stem and 

 on the other side become blended together, a perfoliale 

 leaf will be formed (per, through, folium, leaf), the 

 stem seeming to pass through the leaves. When the 

 bases of two opposite sessile leaves are so united as to 

 form one piece of the two, they are said to be connate. 



Insertion of leaves. 388, Aster laevis (amplexicaul). 389, Uvularia perfoliata. 390. Lonicera sempervirens 



(connate). 



312. Surface. The following terms are applicable 

 to any other organs as well as leaves. In the quality 

 of surface the leaf may be glabrous (smooth), destitute 

 of all hairs, bristles, etc., or scabrous (rough), with 

 minute, hard points, hardly visible. A dense coat of 

 hairs will render the leaf pubescent when the hairs are 

 soft and short ; villous when they are rather long and 

 weak ; sericeous, or silky, when close and satin-like ; 



