Hahnenfußgewächse im Jahreslauf
Zusammenhänge von Pflanzenphänologie mit Grundfragen der Evolution
The development of the forms of the leaf, shoot and blossom in the annual sequence of growth and flower ing of the common native species of Ranunculaceae is discussed.
The annual sequence of the leaf and shoot forms reproduces the essential developmental stages of the on togeny of the dicotyledonous flowering plants. Furthermore, important progressions in the phylogenetic evolution of the dicotyledonous flowering plants are reflected in the sequence of flower forms. Whereas in the leaf sequence the tendency is to juvenilisation (retention), in the flower sequence it is primarily to spe cialisation and differentiation (anagenesis).