| Leaf (2478 words) |
 | For this purpose, a leaf is typically flat (laminar) and thin, to expose the chloroplast containing cells (chlorenchyma tissue) to light over a broad area, and to allow light to penetrate fully into the tissues. |
| The veins are the vascular tissue of the leaf and are located in the spongy layer of the mesophyll. |
| They may be lasting and not be shed (a stipulate leaf, such as in roses and beans); or be shed as the leaf expands, leaving a stipule scar on the twig (an exstipulate leaf). |
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