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 (fĭl′ə-tăk′sĭs) also phyl·lo·tax·y (fĭl′ə-tăk′sē)
n. pl. phyl·lo·tax·es also phyl·lo·tax·ies
The arrangement of leaves on a stem.

phyl′lo·tac′tic (-tăk′tĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˌfɪləˈtæksɪs) or


n, pl -taxes (-ˈtæksiːz) or -taxies
1. (Botany) the arrangement of the leaves on a stem
2. (Botany) the study of this arrangement in different plants
ˌphylloˈtactic, ˌphylloˈtactical adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈfɪl əˌtæk si)

n., pl. -tax•ies.
1. the arrangement of leaves on a stem or axis.
2. the study of such arrangement.
phyl`lo•tac′tic (-ˈtæk tɪk) phyl`lo•tax′ic, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

phyllotaxy, phyllotaxis

1. the arrangement of the leaves on the stem of a plant.
2. the science or study of the arrangement and distribution of leaves. — phyllotactic, adj.
See also: Leaves
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.
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References in periodicals archive ?
Arguments for the latter were the fact that the stamens have highly variable phyllotaxis and show a distinct acropetal polarity in development, as is typical of inflorescences, rather than developing nearly simultaneously, as in normal multistaminate flowers.
pinnata (Figure 1) was sampled from Kuala Krai, Kelantan, Malaysia (5[degrees]31'N 102[degrees]12'E), and its species was identified based on a morphological view of phyllotaxis. Next, A.
For example, leaf shape and leaf phyllotaxis are still not suitable for the constantly changing leaf shape during the growing process [19].
Model testing in phyllotaxis. Journal of theoretical Biology, 156, 4162.
The descriptors were: (i) leafblade division;(ii) leaf composition; (iii) petiole length in relation to leaf blade; (iv) phyllotaxis, (v) leaf position in relation to the branch insertion; (vi) leaf shape; (vii) leaf apex and base angles; (viii) leaf margin category; (ix) venation; (x) leaf length and thickness; (xi) leaf length/thickness ratio; (xii) leaf texture; (xiii) leaf fragrance; (xix) leaf color.
The opposite phyllotaxis for the eophylls of the seedlings of Serjania communis may be considered as exceptional in the Macaranga type, since the first few leaves of the Macaranga are, in most cases, all spirally arranged.
Or why does the Fibonacci sequence describe not only certain population growths (honeybees), but also plant taxonomy (phyllotaxis), music (number of rhythms with one- and two-beat notes), the golden ratio, the golden spiral (galactic spirals), and so on?
A reasonable leaf arrangement (phyllotaxis) on the plant stem will help the plants take advantage of the limited space.
Wang, "Tissue culture of Sinningia speciosa and analysis of the in vitrogenerated tricussate whorled phyllotaxis (twp) variant," In Vitro Cellular and Developmental Biology, vol.