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Fossilised specimens of M. acuminata have been found dating to 20 million years ago, and of plants identifiably belonging to the Magnoliaceae date to 95 million years ago. Another aspect of Magnolia considered to represent an ancestral state is that the flower bud is enclosed in a bract rather then in sepals; the perianth parts are undifferentiated and called tepals rather than distinct sepals and petals. Magnolia shares the tepal characteristic with several other flowering plants near the base of the flowering plant lineage such as Amborella and Nymphaea.
Welcome to other my tree and plant groups:
https://www.desktopnexus.com/groups/birches/ https://www.desktopnexus.com/groups/rhododendrons/ https://www.desktopnexus.com/groups/oaks-and-acorns/