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| Cymose Inflorescence |
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| In cymose inflorescence, the main axis ends in a flower since the peduncle stops growing. The flowers show basipetal succession. The oldest flower is at the apex and youngest towards the base. When the flowers are clustered the arrangement is said to be centrifugal, Here, the oldest flower is at the centre and younger flowers are towards the margin. There are different types of cymose inflorescence. |
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| This is the simplest type of cymose inflorescence where there is only a single flower. The flower may be terminal on a short peduncle or it may be axillary in position, e.g. Hibiscus, Thespesia. |
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| In this type of inflorescence, the peduncle ends in a flower. Subsequently one branch of the peduncle develops at a lower level and ends in a flower. This type of branching is repeated. If the branches are produced on the same side, the inflorescence is said to be a monochasial helicoid cyme. e.g. Hamelia, Drosera. If the branches are produced alternately in a zigzag manner, the inflorescence is called a monochasial scorpioid cyme. e.g. Heliotropium. |
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| fig. 27.43 Monochasidal Cyme |
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| In this type of cymose inflorescence, the peduncle produces a flower at its tip, subsequently the peduncle produces two branches simultaneously at a lower level. They also end in flowers. This type of branching is repeated. If the inflorescence has only three flowers, where the central flower is the oldest and the side ones are younger, it is called a simple dichasial cyme, e.g. Jasmine. If the inflorescence is branched it is called a compound dichasial cyme, e.g. Clerodendrom, Wrightia. |
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| fig. 27.44 Dichasial Cyme |
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| In this type of inflorescence the main axis ends in a flower. Subsequently the peduncle produces many branches and each branch ends in a flower. The flowers show centrifugal arrangement. e.g. Hamelia |
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| fig. 27.45 Polychasial cyme |
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