External Features

External Features - External Features Origin and Internal...

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Unformatted text preview: External Features, Origin, and Internal Structure Taxonomists use an inordinate number of terms as a means to separate and name plants. The terminology applied to the way leaves are attached to the stem, for example, includes alternate —the arrangement shown in Figure 1 —as well as opposite and whorled and is based on the number of leaves attached at each node: one (alternate), two (opposite), and three or more (whorled). If a single blade is attached to a petiole, as in Figure 1 , the leaf is simple; if the blade is divided into two or more individual parts, the leaf is compound and may be pinnately or palmately so depending upon how the leaflets (the individual separate units of the blade) are attached to the extension of the petiole (the rachis ). Other standard terms are used for venation, overall shape, shape of the tip, )....
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