Detail of mature flowers. A. Female flower consisting of a 3 locular ovary (center) surrounded by staminodes (St). scale bar = 375 μm. B. Stigmatic surface showing papillae. Scale bar = 61 μm. C. Top view of staminodes (St). Light colored protuberances correspond to stomata. Scale bar = 300 μm. D. Higher magnification of stomata on the epidermal surface of staminodes (arrows). Scale bar = 38 μm. Insert, close-up of calcium oxalate crystals on the epidermal surface. Scale bar =3 μm. E. top view of synandria (Sy). Scale bar = 375 μm. F. Two atypical flowers in the intermediate zone. St, staminode; arrowhead, incompletely developed gynoecium. Scale bar = 101 μm.