60 MORPHOLOGY OF LEAVKS AS FOLIAGE. [lESSON 8. 



kidney-shai»ed (Fig. 100) or other rounded leaf, with the margins at 

 the base brouglit together and united. 



153. As lO lllC Apt'X, the Ibllowing terms express tlie principal 

 valuations. 



Acuminate, pointed, or taper-pointed, when the summit is more or 

 less prolonged into a narrowed or tapering point, as in Fig. 1)7. 



Acute, when ending in an acute angle or not prolonged point, as 

 in Fig. 104, 98, 95, &c. 



Obtuse, when with a blunt or rounded point, as in Fig. 105,89, &;c. 



Truncate, with the end as if cut ott' square, as in Fig. 106, 94. 



Retuse, with the rounded summit slightly indented, forming a 

 very shallow notch, as in Fig. 107. 



Emarginate, or notched, indented at the end more decidedly, as 

 in Fig. 108. 



Ohcordate, that is, inversely heart-shaped, where an obovate leaf 

 is more deeply notched at the end (Fig. 109), as in White Clover and 

 Wood-sorrel ; so as to resemble a cordate leaf (Fig. 99) inverted. 



Cuspidate, tipped with a sharp and rigid point; as in Fig. 110. 



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

 projection of the midrib; as in Fig. 111. 



Aristate,aivn-pointcd, and bristle-pointed, are terms used when this 

 mucronate point is extended into a longer bristle-form or other 

 slender appendage. 



The first six of tlieie terms can be applied to the lower as well as 

 to the upper end of a leaf or other organ. The others belong to 

 the apex only. 



FIG. 103 - 1 1 1. FormB of the apex of loaves. 



