In the Bentham and Hooker system of classification, the position of certain families like Ceratophyllaceae, Callitrichaceae, and Empetraceae is uncertain, and these unrelated families are placed in a group called "Ordines anomali". This group is included in:

  • A
    Polypetalae
  • B
    Gamopetalae
  • C
    Monochlamydeae
  • D
    Gymnospermae

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