48 



HOW PLANTS GROW. 



13G. The shape at the base. This is concerned in all the following soi'ts : — 



Heart-shaped, or Cordate; wlien of the shape in which u heart is painted, the 

 base having a recess or notch, as in Fig. 98. 



Kidney-slioped, or Reniform ; like heail-shaped, but rounder, and broader than 

 long, as in Fig. 99. 



Auricled, or Eared ; having a f^mall projection or Johe on each side at the base, 

 like a pair of ears, as in Fig. 101. 



Arroic-shaped, or Arrow-headed ; 

 when such lobes at the base are 



Heart-shaped, 

 or cordale. 



Kidney-shaped, 

 or renitbrin. 



Hallierd-shaped, 

 or hasl.tle 



pointed and turned backwards, like the base of an arroAv-head, as in Fig. 100. 



Halberd-shaped, or Hastate ; when such lobes point outwards, giving the whole 

 blade the shape of the halberd of the olden time, as in Fig. 102. 



Shield-shaped, or Peltate ; when the footstalk is attached to some part of the 

 lower face of the blade, which may be likened to a shield borne by the hand with 

 the arm extended. Fig. 104 represents the shield-shaped leaf of a Water-Penny- 

 wort. Fig. 103 is the leaf of another species, which is not shield-shaped. A 

 compai'ison of the two shows how the shield- 

 shaped leaf is made. 



137. As to the Apex or Point, we have the 

 following terms, the first six of which apply 

 to the base as well as to the apex of a leaf : — 



Pointed, Taper-pointed, or Acuminate ; 

 narrowed into a tapering tip, as in Fig. 105. 



Acute ; ending in an acute angle. Fig. 106. 



Obtuse; ending in an obtuse angle, or with a blunt or rounded apex ; as in Fig. 107. 



Truncate ; as if cut off square at the apex, as in Fig. 108. 



Round- kidney- shaped. 



Shield-shaped. 



