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Vernation
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==Involute vernation== {{anchor|involute}}[[Image:Involute_vernation.jpg|thumbnail|These [[cycad]] leaves are produced by ''involute vernation''.]] In '''involute vernation''' both margins on opposing sides of the leaf are rolled up towards the upper (axial) surface of the leaf, forming two tubes that may meet at the [[midrib]] of the leaf.{{clear}}
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