• synonyms


noun, plural phyl·lo·tax·ies. Botany.
  1. the arrangement of leaves on a stem or axis.
  2. the study of such arrangement.
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Origin of phyllotaxy

First recorded in 1855–60; phyllotax(is) + -y3
Related formsphyl·lo·tac·tic [fil-uh-tak-tik] /ˌfɪl əˈtæk tɪk/, phyl·lo·tac·ti·cal, phyl·lo·tax·ic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for phyllotaxy

Historical Examples of phyllotaxy

  • This is the leaf-arrangement or phyllotaxy of the apple-tree, expressed by the fraction 2/5.

    The Apple-Tree

    L. H. Bailey

  • Phyllotaxis, or Phyllotaxy, the arrangement of leaves on the stem, 67.

  • They are arranged densely on the branches, alternately on the 8/21 plan (see section on phyllotaxy).

  • In other cases the width of the leaves is determined by what botanists call the "Phyllotaxy."

    The Beauties of Nature

    Sir John Lubbock

phyllotaxy in Science


  1. The pattern of leaf distribution and arrangement on a stem.
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Related formsphyllotactic adjective
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.