Phyllotaxy is the pattern of leaf arrangement on a stem or branch. A single leaf emerges at each node alternately in China rose, mustard, and sunflower plants.

Phyllotaxy

Leaves arise from the node of the stem. They develop from the shoot apical meristems. Leaves have axillary buds that develop into branches. The three main types of leaf arrangement are:

• Alternate: In this type, a single leaf originates at each node and leaves are arranged in an alternate fashion. E.g. mustard, china rose, sunflower, etc.
• Opposite: In this type of arrangement, two leaves arise at each node and they lie opposite each other. E.g. guava, Calotropis, etc.
• Whorled: In this type of phyllotaxy, more than two leaves arise at each node and form a whorl. This type of arrangement is found in Alstonia.

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By Team Learning Mantras