A rare fossil flower from the Asteraceae family, found in Argentina, proves that daises existed 47.5 million years ago during the mid-Eocene epoch, when modern mammals and birds were becoming widespread.
The fossil, reported in the journal Science, is unusual in showing large flowerheads several centimeters across - unlike fossils of pollen grains, those of flowers are rare.
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Article from The Garden, RHS December 2010
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