Fig. 4.

Developmental model for the evolution from inflorescence flowering (A) to rosette flowering (B and C). Bold arrows mark the transition (floral induction) from the vegetative to the reproductive phase. Within a developmental phase, an arrow indicates promotion of the indicated developmental unit, whereas bars indicate inhibition. Rosette flowering can evolve either by altering the rules of development during the reproductive phase (B), as inferred for Idahoa, or by arresting development in the rosette stage but producing ectopic flowers in place of axillary shoots (C). See text for explanation.