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Obovate, ovate inverted,—the wide part towards the apex.
Leaves of mullein and leaflets of horse-chestnut and
false indigo are obovate. This form is commonest
in leaflets of digitate leaves: why?
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Reniform, kidney-shaped. This form is sometimes seen in
wild plants, particularly in root-leaves. Leaves of
wild ginger are nearly reniform.
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Orbicular, circular in general outline. Very few leaves are
perfectly circular, but there are many that are
nearer circular than any other shape (Fig. 107).
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Fig. 107.—Orbicular Lobed Leaves.
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Fig. 108.—Truncate Leaf of Tulip Tree.
The shape of many leaves is described in combinations of these terms: as ovate-lanceolate, lanceolate-oblong.
The shape of the base and apex of the leaf or leaflet is often characteristic. The base may be rounded (Fig. 104), tapering (Fig. 93), cordate or heart-shaped (Fig. 105), truncate or squared as if cut off. The apex may be blunt or obtuse, acute or sharp, acuminate or long-pointed, truncate (Fig. 108). Name examples.
The shape of the margin is also characteristic of each kind of leaf. The margin is entire when it is not indented or cut in any way (Figs. 99, 103). When not
