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Development from bud to blossom and beyond in H. calycinum. UV-absorbent parts are shaded or shown in black. Note that the UV-absorbent zones (a) on the abaxial side of the petals correspond to petal areas exposed to the outside in the bud. (b) UV-reflectant zone of petal, (c) anthers, (d) filaments, (e) ovarian wall, (f) ovarian contents, and (g) leaves. The ovary is here depicted in the stage shown in Fig. 2, corresponding to about the fifth day after blooming.
