Figure 1.

Heteroblastic and heterochronic variation in Eucalyptus globulus. E. globulus is usually a tall forest tree (A). However, on exposed granitic cliff-tops, E. globulus grows as a precocious ecotype that typically reaches less than 4 m and is often multi-stemmed (D). E. globulus undergoes a dramatic change in vegetative morphology from juvenile (B) to adult (C) foliage (scale bars indicate 5 cm). There is broad genetic-based variation in the timing of this transition (E) from precocious (left) to late (right) in ontogeny in E. globulus.