vernation

from WordNet (r) 3.0 (2006)

vernation
    n 1: (botany) the arrangement of young leaves in a leaf bud
         before it opens

from The Collaborative International Dictionary of English v.0.48

Vernation \Ver*na"tion\, n. [F. vernation: cf. L. vernatio the
   sloughing of the skin of snakes.] (Bot.)
   The arrangement of the leaves within the leaf bud, as regards
   their folding, coiling, rolling, etc.; prefoliation.
   [1913 Webster]