A recent discovery of a 45 million year old fossil in northern Argentina has helped uncover the evolution of the Sunflower Family. Based on genetic comparisons it was believed that the Sunflower Family, whose scientific name is Asteraceae, had its roots in South America about 50 million years ago. The discovery of fossil evidence significantly strengthens this connection. The Asteraceae family includes sunflowers, daisies, and chrysanthemums.
An Asteraceae by Sandy Steinman
To read more: Ancient Fossil is Father of Sunflower Family at Wired Science and Daisy Family Shows its Roots at nature.com
Natural History Wanderings 
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