in Diversity of Living Organisms by

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  1. Order is a group of closely related families which resemble in a few characters.
  2. Fabaceae (Pea family) and Rosaceae (Rose family) are different families because of many differences.
  3. However, they are placed under one order Rosales because of perigynous flowers and marginal placentation.
  4. The name of the order generally ends in the suffix ‘-ales’. E.g. Ranales, Malvales.
  5. The sub-category of order is sub-order.