What are the types of Racemose inflorescence?

Biology Doubts

Simple racemose inflorescence is of following types.

  1. Raceme: Here pedicellate flowers are present on peduncle. E.g Delphinium (Larkspur, Raphanus (Radish), Mustard. For More Biology Doubts check out our biology doubts section.
  2. Spike: Here sessile flowers are present on peduncle. e.g Callistemon (Bottle brush), Amaranthus, Achyranthus, Adhatoda.
  3. Spadix: Here peduncle is thick and fleshy with upper part sterile and lower part bearing one or both the types of unisexual flowers, surrounded by a large brightly coloured bract called spathe e.g: Colocasia (Arum), Arisaema. In maize, the female flowers develop in a spadix.
  4. Catkin (or Amentum): It is pendulous spike which bears female or male flowers but not both. e.g Mluberry.
  5. Strobile: It is like spike inflorescence but flowers develop in the axils of persistent membranous bract. e.g Humulus (Hop)

Corymb

  • Here main axis is comparatively short.
  • Upper flowers have much shorter pedicel than the lower ones, so that all the flowers are brought more or less to the same level. g : Iberis amara (Candytuft)

Corymbose

  • Inflorescence appears like corymb near the growing point.
  • It appears like raceme lower down.
  • Pedicel of the upper flower is shorter as compared to lower flower.
    Ex: Brassica campestris (Mustard)

Umbel

  • Here peduncle is shortened
  • All flowers have pedicel of equal length.
  • All the flowers arise from a single point, like the ribs of an umbrella.
  • At the base of pedicel, there is a whorl of bracts forming an invoucre.
    g Allium cepa (Onion), Hydrocotyle asiatica

Capitulum (Head)

  • Peduncle is flattened called receptacle.
  • A large number of sessile flowers are borne on the receptacle.
  • Two kinds of florets can be recognized on receptacle.
  • Ray florets

These are female or sterile, zygomorphic, arranged in one or more whorls
on the rim of receptacle

Disc florets: These are bisexual, actinomorphic present at centre.

e.g. Sunflower, Marigold

Students can also access the Zoology Notes & Botany Notes from here. 

What are the types of Racemose inflorescence pdf

What are the types of Racemose inflorescence?

What are the types of Racemose inflorescence?

What are the types of Racemose inflorescence?

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