204 



LEAVES. 



stem-clasping, as in many umbelliferous plants ; or connate, 

 situate opposite each other, and united at the base, circum- 



FIG. 146. 



scribing the stem, as in the leaves of the honeysuckle ; or 

 they are decurrent, running down the stem, &c., &c. 



FIG. 147. 



FIG. 148. 



As regards shape, their modifications are innumerable; 

 the chief of these, as regards fossil plants, are as follows : 

 They are linear, narrow, and long, with parallel sides, and ot 

 equal breadth throughout ; or lanceolate, of a narrow, oblong 

 form, tapering towards each end; verticillate, growing in 

 rings or whorls ; they are, farther, ovate, egg-shaped ; obovate, 

 the same form with the large end upwards ; cordate, heart- 

 shaped, obcordate the heart-shape reversed ; hastate, spear- 

 shaped ; auriculed, having appendages like ears ; lobed, with 

 the margins of their segments rounded, while, according to 

 the number of lobes, the leaf is termed bilobate, trilobate, 

 &c. ; they are adherent or not adherent to the stem, or to 



