noun Botany.
the arrangement of the foliage leaves within the bud.

1785–95; < Neo-Latin vernātiōn- (stem of vernātiō), equivalent to Latin vernāt(us) (past participle of vernāre to be verdant; see vernal, -ate1) + -iōn- -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vernation (vɜːˈneɪʃən)
the way in which leaves are arranged in the bud
[C18: from New Latin vernātiō, from Latin vernāre to be springlike, from vēr spring]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
vernation   (vûr-nā'shən)  Pronunciation Key 
The arrangement of young foliage leaves within a bud. The coiled arrangement of young leaves in fern fiddleheads is known as circinate vernation and protects the delicate leaf tips as they develop.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Ibo stroller stood a while, listening to their con vernation.
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