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stipule| Outgrowth arising from the base of a leaf or leaf stalk in certain plants. Stipules usually occur in pairs or fused into a single semicircular structure. |
| They may have a leaflike appearance, as in rose plants Rosa; be spiny, as in black locust Robinia pseudoacacia; or look like small scales. In some species they are large and contribute significantly to the photosynthetic area, as in the garden pea Pisum sativum. |
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