Figure 2
Comparison of floral structures between the male and female stages of A. acuminatus and a co-flowering species, showing a visiting Taiwan Yuhina (Y. brunneiceps). The stamens of A. acuminatus are colored dark red, the anthers of P. campanulata are light pink, and the pistils of both species are indicated in green. Yellow dots indicate the potential pollen placement on the bird, as estimated from morphological measurements. The key characters in the illustrations are all drawn according to the same scale, shown at the bottom of the figure. (A) Male stage of A. acuminatus. The protruding stamens in this phase deposit pollen on the Yuhina’s crest. (B) Female stage of A. acuminatus. The extended gynoecium reaches almost exactly the same point on the Yuhina’s crest. (C) Co-flowering species, P. campanulata. Both the stamens and the gynoecium reach the base of the Yuhina’s beak.
