parted, if the sinuses reach two thirds or more to the midrib (Fig. 97);
divided, if sinuses reach nearly or quite to the midrib.
The parts are called lobes, divisions, or segments, rather than leaflets. The leaf may be pinnately or digitately lobed, parted, cleft, or divided. A pinnately parted or cleft leaf is sometimes said to be pinnatifid.
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Fig. 97.—Digitately Parted Leaves of Begonia.
Leaves may have one or all of three parts—blade, or expanded part; petiole, or stalk; stipules, or appendages at the base of the petiole. A leaf that has all three of these parts is said to be complete (Figs. 91, 106). The stipules are often green and leaflike and perform the function of foliage, as in the pea and Japanese quince (the latter common in yards).
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Fig. 98.—Oblong-ovate Sessile Leaves of Tea.
Leaves and leaflets that have no stalks are said to be sessile (Figs. 98, 103), i.e. sitting. Find several examples.
