Tapering to a rounded edge. Arrowhead-shaped, with two pointed lower lobes. Leaf Margins Studying leaf margins is especially useful in the identification of certain varieties of fruit plants. A smooth edge with no teeth or notches. Having small, sharp teeth pointing toward the apex.
Incisions extend less than halfway to the midrib.
The various ways leaves are arranged along a stem are also used to help identify plants. Rosulate arrangement is one in which the basal leaves form a rosette around the stem with extremely short nodes. Opposite leaves are positioned across the stem from each other, two leaves at each node. Alternate or spiral leaves are arranged in alternate steps along the stem with only one leaf at each node. Whorled leaves are arranged in circles along the stem.