PLATE 5

A. Longitudinal section through shoot apex, x100; W young leaf, (A) shoot apex, (fb) floral primordium, (ol) older leaf.
B. Longitudinal section through shoot apex showing meristem, x430; (t) tunica, (pm) peripheral meristem, (rm) rib meristem, (si) central subapical initials.
C. Section showing young floral primordium, x100; (s) sepal initiation, (st) stipule, W developing leaf.
D. Section through developing floral primordium, x200; (s) inception of sepal, (t) tunica, (pm) peripheral meristem.