“…Having a smooth, lustrous surface is an efficient way of being conspicuous and gloss is another optical effect, produced by physical means, which has been described in flowers of multiple species (Fig. 1c) (Parkin, 1928;Gaisterer et al, 1999;Vignolini et al, 2012a,c;Whitney et al, 2012;Papiorek et al, 2014). Petal gloss can be defined as the specular reflection of light from the surface of the petal and this effect is maximized when the petal surface is flat (Gaisterer et al, 1999;Whitney et al, 2012).…”