170 FIGURES OR SHAPES OF LEAVES, 
shape of the lamina we mean the superficial aspect or figure 
which is described by its margins. The development of veins 
and parenchyma is usually nearly equal on the two sides of the 
midrib or petiole, so that the lamina of the leaf is in most 
instances nearly symmetrical and of some regular figure; in 
which case the leaf is said to be equal (figs. 343--346). When, 
HiGacots Fic. 338. Fic. 339. Fic. 340. 
s 
vs 
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Fig. 3438. Fig. 344. Fie. 345. Fie. 346. 
Fig.337. Leaf of Elm, with its margins biserrate, and the lamina unequal at 
its base. Fig. 338. Unequal or oblique leaf of a species of Begonia. —— 
Fig. 339, Linear leaf of Goose-grass (Galium Aparine).——§ Fig. 340, Lance- 
olate leaf.——Fig, 341. Acerose or needle-shaped leaves of Juniper (/uni- 
perus communis ).—Fig. 342, A cuneate and mucronate-pointed leaf,—— . 
Fig, 343. Cordate and acuminate leaf, with its margins dentate.——Fig. 
344. Oblong leaf of Bladder-Senna (Colutea arborescens). Fig, 345, Ovate 
leaf, with its margins serrate-——Fig. 346. Obovate leaf, 
as occasionally happens, the lamina of the leaf is more de- 
veloped on one side than on the other, the leaf is termed 
unequal or oblique (figs. 335 and 337); this is remarkably the 
case in the species of Begonia (fig. 338). Generally speaking, 
the leaves with ribbed, parallel, or feather-veined venation, 
are longer than broad; while those which are radiated or 
