noun, plural phyllotaxies. Botany.
the arrangement of leaves on a stem or axis.
the study of such arrangement.

1855–60; phyllotax(is) + -y3

phyllotactic [fil-uh-tak-tik] , phyllotactical, phyllotaxic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
phyllotaxis or phyllotaxy (ˌfɪləˈtæksɪs)
n , pl -taxes, -taxies
1.  the arrangement of the leaves on a stem
2.  the study of this arrangement in different plants
phyllotaxy or phyllotaxy (ˌfɪləˈtæksɪs, -ˈtæksiːz)
phyllo'tactic or phyllotaxy

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
phyllotaxy   (fĭl'ə-tāk'sē)  Pronunciation Key 
The pattern of leaf distribution and arrangement on a stem.

phyllotactic adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
What may be more likely in both of these seizures is that it is an unintentional occurrence of whorled phyllotaxy.
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