| Term | Definition |
|---|
| blade | the flat, green portion of a leaf |
| petiole | leafstalk |
| sessile leaves | leaves which lack a petiole and are attached by a sheath instead |
| stipules | small leaflike structures that helped to cover the leaf when it was developing |
| buds | contain developing leaf or stem structures |
| leaf scars | scars on stems that show where leaves had previously grown |
| bud scars | scars on stems that show where one season's growth ended and the next began |
| nodes | the points at which leaves grow from the stem |
| opposite arrangement | when 2 leaves grow from each node |
| alternate arrangement | only one leaf growing from each node in an alternating pattern up the branch |
| whorled arrangement | three or more leaves growing from each node |
| rosette arrangement | basal arrangement, cluster of leaves growing around the base of the plant |
| phototropism | the growth response of a plant stimulated by light |
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