Pic. 64: Filled blossom of a cultivated form of the daisy (left). The cultivated form shows in contrast to the wild form (right) an increase of the sterile ray florets at the expense of the fertile, small (yellow) tubular florets and a higher amount of pigments.
Source: R. Junker & S. Scherer: Evolution - ein kritisches Lehrbuch. Gießen 2001