Fig. 4

Scanning electron micrographs of floral development of Macleaya cordata. a Developing inflorescence; note the larger terminal flower. b Initiation of sepals. c, d Initiation of the first whorl of homeotic stamens, alternate to the sepals (*₁). e–g Successive initiation of the second whorl of homeotic stamens, opposite to the sepals (*₂), and the single whorl of four, decussate true stamens (1). h–j Growth of the stamens and the short, sessile gynoecium. C Carpel, S sepal, * homeotic stamens; 1, first whorl of true stamens. Bars a, j = 100 µm; b–g = 10 µm; h, i = 50 µm