Why are plant families in the APG system expected to be monophyletic groups?

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Water mint (Mentha aquatica) — Lamiales The lilac-pink flowers of the water mint attract butterflies and beetles.

In the Angiosperm Phylogeny Group (APG) system, plant families and orders are expected to be monophyletic because the system is phylogenetic, meaning it organizes organisms based on their evolutionary history and descent from a common ancestor.12

A monophyletic group, or clade, consists of an ancestor and all of its descendants. By requiring families to be monophyletic, the APG system ensures that these taxonomic groups accurately reflect natural evolutionary lineages rather than being based solely on superficial similarities or artificial groupings. This approach allows botanists to organize plant diversity in a way that is consistent with robust, testable molecular data, providing a more accurate representation of how different plants are related through evolution.312