Which group of angiosperms is thought to contain the most primitive living members?

Question

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Amborella is considered to be the most primitive living angiosperm, as it has a combination of features that are thought to resemble those of the earliest angiosperms. Magnoliids and water lilies are also considered to be among the earliest groups of angiosperms, but Amborella is thought to be the most primitive living member of the group. Asterids and orchids are more derived groups of angiosperms.

Which Group of Angiosperms Is Thought to Contain the Most