The 'Cronquist System' of Flowering Plant (Magnoliophyta) classification (Arthur Cronquist. 1988. The Evolution and Classification of Flowering Plants) groups flowering plants into two classes (monocots and dicots) with related Orders (groups of families) placed in Subclasses.
Internet information for a given family can be obtained by browsing its Subclass page (listed above) or, by using the family finder, which provides alphabetical selection of the family name and direct placement on the appropriate Cronquist Subclass page