in Morphology of Flowering Plants by

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  1. The thalamus of a flower is the enlarged and condensed axis.
  2. It has nodes and very short internodes.
  3. It bears the floral whorls at the nodes.
  4. These whorls are arranged in a definite sequence.
  5. This sequence is calyx, corolla, androecium and gynoecium at the successive nodes.
  6. This evidence proves that flower is a modified shoot.
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The flower is said to be a modified shoot because flower has nodes and inter nodes similar to the vegetative shoot. But the inter node are condensed and the number of appendages arising from the nodes are numerous.

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