Fig. 2. Ectopic floral organs arise from the placentae. (A-E) Longitudinal sections of floral buds, whereas F and G are whole-mounts where images were captured using Nomarski optics. Stages of floral development are indicated in the bottom-left of each panel. (A) Early gynoecium initiation in a wild-type Ws flower bud. (B) Wild-type Ws gynoecium with ovule primordia. (C) knu gynoecium showing ectopic primordium developing from placental tissue. (D) Developing ectopic organs inside the basal one-third of a primary knu pistil. (E) Ectopic primordium interspersed with developing ovules inside a primary knu pistil. (F) Ectopic floral primordium developing inside primary knu pistil. (G) Ectopic carpel and stamen primordia developing inside primary knu pistil. Scale bars: 25 µm in A,E; 50 µm in B-D,F,G. a, anther; ecp, ectopic carpel primordium; ep, ectopic primordium; es, ectopic stamen; fp, floral primordium; gy, gynoecium; op, ovule primordium; se, sepal; st, stamen.