A leaf (PO:0025034) in a vascular plant. [source: POC:curators]
Has vascular tissue. From APweb Glossary: In angiosperms, commonly thought of as one of the three basic parts of the seed plant body, a structure usually of determinate growth, without secondary thickening, and of superficial origin, often flattened and photosynthetic in part, and in the axil of which is found a bud. Occurs in the sporophytic phase of a plant life cycle.