Chrysanthemum leucanthemum - Two photographs of Marguerite or Ox-eye Daisy, sometimes classified as Leucanthemum vulgare, and its description. - http://www.plant-identification.co.uk/skye/compositae/leucanthemum-vulgare.html
Chrysanthemum segetum - Photograph of Corn Marigold and its description. - http://www.plant-identification.co.uk/skye/compositae/chrysanthemum-segetum.htm
Chrysanthemum coronarium (Crown Daisy) - Information and photo gallery by Stephen Mifsud of Malta. - http://www.marz-kreations.com/WildPlants/ASTR/Chrysanthemum_coronarium.html