THEIR STRUCTURE AND FORMS. 



97 



Acute, ending in an acute angle, without special tapering, as 

 in Fig. 181. 



Obtuse, ending with a blunt or roundish extremity, Fig. 182. 



Truncate, with termination as if cut off by a straight transverse 

 line, as in Fig. 183. 



Retuse, with an obtuse extremity slightly depressed or re-enter- 

 ing, as in Fig. 184. 



Emarginate, with a more decided terminal notch, Fig. 185. 



Obcordate, inversely heart-shaped, i. e. like cordate, but the 

 broader end and its strong notch at apex instead of base, Fig. 

 186. This and the following terms are applicable to apex only. 



Mucronate, abruptly tipped with a small and short point, like a 

 projection of the midrib, as in Fig. 188. 



Cuspidate, tipped with a sharp and rigid point, as in Fig. 187. 



184. As to Margin or special Outline, the terminology proceeds 

 upon the convenient supposition of a blade with quite entire margin, 

 but subject to incisions, which give rise to notches or clefts, if we 

 regard the sinuses ; or to teeth, lobes, segments, &c., if we regard 

 the salient portions between the sinuses. The ribs, or the stronger 

 veins, &c., commonly terminate in the teeth or lobes ; but in Cicuta 

 maculata, and in a few other cases, they run to the notches. 



185. Dentation relates to mere marginal incision, not extend- 

 ing deeply into the blade. The blade is said to be 



Entire, 1 when 

 the margin is com- 

 pletely filled out 

 to an even line, as 

 in Fig. 173-179. 



Serrate, when 

 with small and 

 sharp teeth direct- j 

 ed forward, like 

 the teeth of a saw,' 

 as in Fig. 189. 



Serrulate is the m 190 m 192 193 m 



diminutive of serrate, and is equivalent to minutely serrate. 



1 Integerrimus-a-um, or quite entire, is the term in Latin terminology. Inte 

 ger means undivided or not lobed. 



FIG. 180-188. Terminations of leaves. 



FIG. 189-191 Dentation of pinnately veined leaves. 



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