This Online Guide to North American Wildflowers is a complete interactive guide to more than 1,800 wildflowers in North America. This guide is directed toward the user whose interest in wildflowers is new as well as toward those who are not novices and who know many wildflowers but wish to learn more. more about the guide
e.g. Radially Symmetrical Flowers, Rounded Clusters...
e.g. Mallow, Primrose, and Orchid...