Genus names are linked to color photographs, most of which are from The Vascular Plant Image Gallery, at Texas A&M Univeristy. This site has a large database of images with an easy search option.
Corolliferae - typical-looking flowers
Apetalae - without petals Floriferae - appear to have petals
Polypetalae - free petals Hypogynous - superior ovary
Polypetalae - free petals Epigynous - inferior ovary
Sympetalae - united petals Hypogynous - superior ovary
Sympetalae - united petals Epigynous - inferior ovary