Figure 1. A simplified scheme summarizing the various genes and pathways involved in floral transition. For simplification several circuits have been omitted. Arrows indicate positive inputs and blocked lines represent inhibitory inputs and the lines do not necessarily indicate direct activation or repression.

Figure 2. A scheme detailing the ABC model and the mutant phenotypes when corresponding functions are missing. To the left, a series of longitudinal sections representing half-flowers are shown describing the phenotype of wild type and various mutants lacking the indicated function. At the top, the whorl numbers are indicated. To the right, a cartoon depicts an overview of the types of floral organs and their concentric arrangement. Ca, carpel; Pe, petal; Se, sepal; St, stamen and WT, wild type. Adapted from Weigel and Meyerowitz (1994).