There are two basic leaf types: simple and compound leaves. Simple leaves have buds or shoots in all forks formed by petioles and twigs. Compound leaves appear to have neither buds nor shoots in the forks formed by what appear to be the petioles and the twigs. This results from the fact that the apparent leaves are in fact leaflets and therefore constitute a portion of a compound leaf. The leaf proper in a compound leaf consists of a number of leaflets, and a central twig-like axis to which the leaflets are attached. Buds and new shoots occur in the fork formed by the compound leaf axis and the true twig.