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INTRODUCTION
5
When a leaf stands independently on a single stalk it is called simple. Among the various forms of simple leaves we may mention the following:—
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- Needle-shaped, when they are long and equally thick and broad (fig. 2).
- Elliptical, when they are twice as long as broad (fig. 6).
- Orbicular, when they are about as long as broad (fig. 7).
- Rhomboidal, when four-sided (fig. 8).
- Triangular (fig. 9).
- Linear, when they are several times as long as broad, with parallel sides (fig. 3).
- Lanceolate, when they are three or four times as long as broad, and pointed at the end (fig. 4).
- Elongate, like the last, but with obtuse ends (fig. 5).
- Ovate, when the upper end is narrower than the lower, and the leaf is not more than twice as long as broad (fig. 10).
- Obovate, when the lower part is narrower than the upper (fig. 11).
- Conical, when the upper portion is broader
