Development of synandrodes and atypical flowers. A. Atypical female floral primordia (1, 2). Scale bar = 150 μm. B. Atypical female flowers showing bicarpellate (2) and unicarpellate (1) gynoecia. Scale bar = 150 μm. C. Early stages of development of flowers in the intermediate zone. 1, unicarpellate female flower. 2, bicarpellate female flower. 3, atypical flower with incompletely formed gynoecium (center). 4, atypical flower with 4 staminodes. 5–7, Sterile male flowers (synandrodes) with 4 and 5 staminodes respectively. Scale bar = 150 μm. D. Intermediate zone showing atypical flowers. 1–2, sterile male flowers with 5 and 4 staminodes respectively. 3, Sterile male flower with incompletely fused staminodes. 4, Typical synandrode. Scale bar = 300 μm. E. Atypical flowers with rudimentary gynoecia (arrowheads) surrounded by 4 to 5 staminodes. Scale bar = 150 μm. F. Atypical sterile flowers with incompletely developed staminodes surrounding an undetermined structure (asterisk). Scale bar = 300 μm.