FIGURE 13.14 Black-eyed Susan(Rudbeckia sp )as seen by distribution of flavonols in the rays and the sensitivity of humans(A)and as it might appear to honeybees(B).(A) insects to part of the UV spectrum contribute to the To humans, the golden-eye has yellow rays and a brown "bull s-eye"pattern seen by honeybees, which presumably central disc. (B) To bees, the tips of the rays appear"light helps them locate pollen and nectar. Special lighting was ellow, "the inner portion of the rays"dark yellow, and used to simulate the spectral sensitivity of the honeybee the central disc"black "Ultraviolet-absorbing flavonols are visual system. Courtesy of Thomas Eisner. found in the inner parts of the rays but not in the tips. The Figure 5-12-1Figure 5-12-1