There is often no clear anatomical distinction between leaf and stem. The crown is the junction of the root and stem. A shoot is a stem with leaves.
Trees are shrubs are perennials.
Annual plants can usually herbaceous. Stipules can be glandular, leafy, spiny, or scale-like. In many cases, the stipules fall off shortly after the leaf expands. Many plants completely lack stipules. For example, the leaves of carnivorous plants are modified into traps.