Most authors agree that roses of prehistoric times with five petals. The only rose known to have corollas of four petals is rosa sericea. Fossil finds testify to the remote origins of the rose; but millions of years went by without any further evidence of its presence. The anomalous presence on one of the known roses of six petals has authoritatively been ascribed to the personal initiative of the artist who long ago restored the fresco; another theory suggests that this six-petal flower represents the first phase in a transition from a single to double corolla, such a transformation being quite consistent; in any event, with rosa gallica.
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