Floral development in Toona ciliata. (A) Longitudinal microtome section of a male flower meristem at stage 3. (B) Longitudinal section of a late stage 5 flower meristem. (C) Flower meristem at stage 5, with differentiating sepal and petal primordia. (D) Flower meristem at stage 9, showing the stamen primordia bending inwards over the developing carpel primordia. (E) Initiation of post-genital fusion between adjacent carpels in an early stage 9 female flower meristem. (F) Longitudinal section of a late stage 9 stage flower meristem. an, anther; br, bract; ca, carpel primordia; fm, flower meristem; pe, petal primordium; se, sepal primordium; sp, stamen primordium. Scale bars: A = 50 µm; B, D, F = 80 µm; C = 90 µm;E = 40 µm.