Dilleniales is an order

Order (biology)

In scientific classification used in biology, the order is# a taxonomic rank used in the classification of organisms. Other well-known ranks are life, domain, kingdom, phylum, class, family, genus, and species, with order fitting in between class and family...

 of flowering plants. The Cronquist system

Cronquist system

The Cronquist system is a taxonomic classification system of flowering plants. It was developed by Arthur Cronquist in his texts An Integrated System of Classification of Flowering Plants and The Evolution and Classification of Flowering Plants .Cronquist's system places flowering plants into two...

, of 1981, recognized such order and placed it in subclass Dilleniidae

Dilleniidae

Dillenidae is a botanical name at the rank of subclass....

. It used the following circumscription:

• order Dilleniales

  family Dilleniaceae

  Dilleniaceae

  Dilleniaceae is the botanical name for a family of flowering plants. Such a family has been universally recognized by taxonomists. It is known to gardeners for the genus Hibbertia, which contains many commercially valuable garden species....

  
  

  family Paeoniaceae

The APG II system

APG II system

The APG II system of plant classification is the second, now obsolete, version of a modern, mostly molecular-based, system of plant taxonomy that was published in April 2003 by the Angiosperm Phylogeny Group. It was a revision of the first APG system, published in 1998, and was superseded in 2009...

, of 2003, assigns the first of these families to the core eudicots, unplaced as to order, while debating either including it in order Caryophyllales

Caryophyllales

Caryophyllales is an order of flowering plants that includes the cacti, carnations, amaranths, ice plants, and many carnivorous plants. Many members are succulent, having fleshy stems or leaves.-Description:...

 or reinstating the order Dilleniales.

The APG II system assigns the second of these families, the Paeoniaceae, to the order Saxifragales

Saxifragales

Saxifragales is an order of flowering plants. Their closest relatives are a large eudicot group known as the rosids by the definition of rosids given in the APG II classification system. Some authors define the rosids more widely, including Saxifragales as their most basal group. Saxifragales is...

.