Fig. 1. Morphology of jag floral and vegetative organs. (A) Wild-type Landsberg erecta flower. (B,C) jag-3 flower with narrow petals curling towards adaxial surface. Sepal with serrations at the distal tip is marked with an asterisk. (D) jag-2 flower. (E) SEM of jag-3 flower with a narrow sepal (arrowhead). (F) jag-3 abaxial petal with buckled margins. (G) jag-3 stamens fused along filament margins. (H) jag-3 gynoecium abnormally fused at the stigma. (I) Wild-type inflorescence with sepals enclosing floral buds. (J) jag-3 inflorescence with gynoecium protruding from floral bud (arrowhead). A wide medial sepal is present on the same flower (white arrow). A black arrow indicates a stage 7 flower with carpels protruding. (K) jag-3 early floral primordia with an extra sepal primordium initiated (arrow). (L) Petal primordium (p) from stage 9 jag-3 flower. (M) Petal primordium (p) from stage 10 jag-3 flower. (N) Wild-type 7-day post germination seedling. (O) jag-3 seedling with altered cotyledon shape. (P) Fifth rosette leaf from wild-type (left) or jag-3 (right) that has serrated margins. Scale bar: 100 µm (E-K,M); 10 µm (L); 1 mm (N-P).