Fig. 1. seu-3 modifies ett-7 in all floral whorls. (A-E) Top-down views. (F-J) Side views. (A) Wild-type flower showing four evenly spaced petals, six stamens and the stigma at the top of the central gynoecium. (B) seu-3 flower showing smaller, narrower petals, shorter stamens and a split gynoecium. (C) Close up of seu-3 gynoecium in B showing two balls of stigmatic tissue and two splayed valve tips. (D) ett-7 flower showing five petals, six stamens and a wide stigma resulting from overproliferation of apical tissues. (E) ett-7 seu-3 flower showing one very narrow petal (arrow), one stamen (arrowhead) and a round stigma. (F) Wild-type flower showing two full ovaries, with arrows delimiting top and bottom of the right valve. (G) seu-3 flower showing smaller petals and shorter pollenless stamens. Ovaries are full length, but the unfused distal gynoecium results in a horn-like protrusion (arrow) and an exposed ovule (arrowhead). (H) ett-7 gynoecium has only one reduced ovary (arrows at valve boundaries), with the distal gynoecium appearing Y-shaped from basalized stigmatic and stylar tissue (arrowhead). (I) ett-7 seu-3 flower showing reduced filamentous sepals and petals (arrowhead and arrow, respectively), few stamens and a stalk-like gynoecium. (J) ett-7 seu-3 flower showing one normal stamen, one stamen fused along its entire length with the gynoecium (arrowheads) and one valve that is open at the top (arrow). Genotypes described are in Col. Scale bars: 1 mm.