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| Phyllotaxy |
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| The pattern of arrangement of leaves on the stem is called phyllotaxy. There are three main types of phyllotaxy. |
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| In this type, a single leaf arises at each node. The consecutive leaves are produced in a spiral manner around the stem. e.g. Polyalthia, Hibiscus, etc. |
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| In this type, the leaves are arranged in pairs at each node. |
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| When the opposite leaves arise in the same plane at successive nodes, it is said to be opposite superposed phyllotaxy. e.g., Quisqualis. |
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| When each opposite pair of leaves are at right angles to each other, phyllotaxy is said to be opposite decussate. e.g., Calotropis Ixora |
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| If more than two leaves occur at a node, the phyllotaxy is said to be whorled. e.g., Nerium. |
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| fig. 27.37 - Types of Phyllotaxy |
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