Figure 2.

Floral displays as seen by the human and the bee eye. Floral displays of T. sidoides spp. pinnatifida (b,c) and their respective models, S. cordobensis (a) and M. malvifolium (d), in Córdoba (a,b) and Salta (c,d). Appearance to the human eye (first row), and bee-views of floral displays (second and third rows; Vorobyev et al. 1997), where primary colours (blue, green and red) label the bee photoreceptor excitations (short (S), medium (M) and long (L) wavelength sensitive). The third row simulates the low spatial resolution of a bee eye corresponding to a distance to the flower (16° angular subtense or 6–9 cm distance) where bees start exploiting chromaticity of floral pattern as a visual cue.