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Dillenidae is a botanical name at the rank of subclass. Circumscription of the subclass will vary with the taxonomic system being used; the only requirement being that it includes the family Dilleniaceae. A well-known system that uses this name is the Cronquist system, and in the original 1981, version of the system the circumscription was:

• subclass Dilleniidae

  order Dilleniales

  order Theales

  order Malvales

  order Lecythidales

  order Nepenthales

  order Violales

  order Salicales

  order Capparales

  order Batales

  order Ericales

  order Diapensiales

  order Ebenales

  order Primulales

Recent molecular systematic studies have shown that this group is polyphyletic. The APG II system does not use formal botanical names above the rank of order but assigns the plants involved to various orders in the asterids and rosids clades.