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Explain the special type of inflorescence with labeled diagrams.

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Special type of inflorescence: The following are some of the special types of inflorescences.

1. Hypanthodium:

Here, the inflorescence is highly reduced. It has a cup shaped receptacle formed by the fusion of five bracts. On the surface of this cup, generally a yellow coloured nectar secreting gland is present. A single female flower arises from the centre of the cup. It is highly reduced and is borne on a long stalk. The male flowers are highly reduced and are produced in a scorpioid manner from the axil of each bract; e.g. Ficus (Banyan) and Fig tree.

2. Cyathium:

It is a,compound inflorescence which looks like a single flower. The peduncle terminates into a single female flower. It is surrounded by a large number of male flowers arranged in scorpioid cyme. The female flower is represented by only a single tricarpellary and syncarpous gynoecium. Each male flower consists of a single stalked stamen. Male flower borne in axis of a scaly bract. Whole inflorescence is enclosed within a cup shaped involure which is often glandular e.g., Euphorbia.

3. Verticillaster:

It is characterstics of family Labiate. It is a dhasial cyme which is reduced to two scorpioid cyme , one on each side of the nodes of inflorescence axio. Tire inflorescence axis consists of a series of nodes. At each node there are two opposite bracts. In the axil of each bract there is a dichasial cyme, i.e., the main axis terminates in to one large flower and forms two lateral branches which also terminate into two flowers. After this stage it changes into monochasial cyme. Flowers are sessile or sub – sessile, e.g., Ocimum, Mentha, Leucas etc.

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