Fig. 1. Observation of flower development in Brassicacae, from drawing to live confocal imaging. A. Early flower development in Cheiranthus cheiri as drawn by Payer [6]; drawings show stages equivalent to stages 2–7 in Arabidopsis (stages as described in [71]). B–D. Scanning electron microscope images of developing Arabidopsis flower buds, stages 8 (B), 10 (C) and 12 (D); images courtesy of Smyth and Bowman; images in panels B and D were originally published in [71]. E. Maximum intensity projection of a confocal z-stack of a live stage 4 Arabidopsis flower expressing fluorescent reporters for DORNROSCHEN-LIKE (green; [70]), SUPERMAN (red) and CLAVATA3 (cyan; [72]); cell walls were stained with propidium iodide (grey). F. Maximum intensity projection of a confocal z-stack of a live stage 7 Arabidopsis flower expressing a fluorescent reporter for CRABS CLAW (green); cell walls were stained with propidium iodide (red). G. Maximum intensity projection of a confocal z-stack of a live Arabidopsis inflorescence expressing fluorescent reporters for APETALA3 (green), SUPERMAN (red) and CLAVATA3 (blue); cell walls were stained with propidium iodide (grey).