Leaves come in a wide variety of shapes, sizes, textures, and colors. Put another way, leaf morphology differs dramatically from one species of plant to another. Observation of actual plants will quickly confirm each of these assertions. In fact, a very long list of terms exist which can be used to account for different aspects of leaf morphology. A few such words which describe leaf shape include: linear, oblong, lanceolate, cuneate, spathulate, elliptical, deltoid, and reniform. Another set of words exists to describe leaf margins (the edges of leaves), including: entire, lobed, undulate, serrate, crenate, etc. And then there are words to describe patterns of leaf veination, such as: arcuate, longitudinal, rotate, parallel, etc. Ultimately words cannot fully account for all leaf variation and so it's nice to have images available to document these differences.