Fig. 2

Scanning electron micrographs of floral development of Stylophorum diphyllum. a Flower primordium. b Sepal initiation. c, d Initiation of petals (arrows in c), stamens (numbered) and gynoecium. e–h Successive growth stages of stamens and gynoecium; some stamens removed in f and g. Br bract, C carpel, P petal, S sepal; 1, 2, first and second sets of the first whorl; 3, stamens of the second whorl; 4, stamens of the third whorl. Bars a–c = 50 µm; d–h = 100 µm