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The ancestral flower was bisexual with multiple whorls (concentric cycles) of petal-like organs, in sets of threes.
Copyright: Hervé Sauquet/Jürg Schönenberger.
What flowers looked like 100 million years ago.
Flowering plants are by far the most diverse group of plants comprising some 300,000 different species. They were, however, late on the scene in evolutionary terms, only evolving some 140 million years ago.
This puts their evolution towards the end of the age of dinosaurs in the Cretaceous when the ancestors of mammals were still mammaliaform synapsids. The evolution of the first flowering plants is one of those enduring mysteries for evolution to explains, Darwin himself referring to it as "an abominable mystery".
Now a new study coordinated by Juerg Schoenenberger from the University of Vienna and Hervé Sauquet of the Université Paris-Sud has shed more than a little light on what the first flowers looked like. The same study has also reconstructed what flowers at the key divergence point looked like.