Juvenility gradients in trees

Juvenility in a regulary shaped conifer:
the degree of juvenility of an apical
meristem is inversely proportional to
the distance (along trunk and branches)
between the root-shoot junction (A)
and the meristem. The distance AB>AC>
AD>AE>AF, and therefore, meristem B is
the most mature, and meristem F is the
most juvenile.

(Bonga and Durzan, 1982)