Inflorescence

In angiosperms, flowers can occur either singly or in groups. When a single flower is present, it is called a solitary flower. When flowers occur in groups, it is called an inflorescence. The axis of an inflorescence is known as peduncle and the stalk of the flower is called pedicel.

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There are two types of inflorescence.

1. Racemose Inflorescence (Indefinite inflorescence)

  • The peduncle is elongated and grows indefinitely.
  • Flowers are arranged in Acropetal succession.
  • In Acropetal succession the younger flowers are seen at the tip of the inflorescence and the older ones are found at the base.
  • Sometimes, the flowers are arranged in centripetal manner. The younger flowers are arranged in the centre, and the older flowers are seen towards the periphery.

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Acropetal succession Centripetal Manner

2. Cymose Inflorescence (Definite inflorescence)

  • In this inflorescence, the peduncle ends in a flower.
  • The further growth of the inflorescence occurs as growth of the branches.
  • Each branch also terminates in a flower.

  • Hence older flowers are seen at the top and the younger flowers are arranged laterally towards the base.
  • It is known as Basipetal succession. Sometimes, the flowers are arranged in centripetal manner.

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