Pines (genus Pinus) are commonly called evergreens because they bear leaves year round, continually producing new needles as they gradually drop older ones. Characteristically, pine needles form in bundles that are spirally arranged along supporting shoots. Each bundle contains a specific number of needles associated with a particular type of tree. Pines having two or three needles in a bundle are typically hard pines. Bundles of five needles are generally characterized as soft pines.