The following terms apply to the various modifications of the margin, as such, not affecting the general outline of the leaf.
f, dentate; g, serrate; h, laciniate; k, incised; I, erose.
278. Entire, even edged, having the tissue completely filled out. Sometimes a vein runs along the margin, which might otherwise be easily torn, as in the Caladium. But when the marginal tissue is deficient, the leaf becomes
279. Dentate, having sharp teeth pointing outward from the centre; serrate, with sharp teeth pointing forwards, like the teeth of a saw; crenate, with rounded or blunt teeth. The terms denticulate, serrulate, crenulate, denote finer indentations of the several kinds; doubly dentate, etc, denote that the teeth are themselves toothed.
280. The undulate, or wavy edge is somewhat different from the repand, which bends like the margin of an umbrella. If the veins project, and are tipped with spines, the leaf becomes spinous.
281. Irregularly divided margins are said to be erose or jagged, laciniate or torn, incised or cut.
282. Crisped. Often, instead of a deficiency there is a superabundance of marginal tissue, denoted by the term crispate or crisped.