Which evidence supports the placement of Pandanales among non-commelinid monocots?

The placement of the order Pandanales among non-commelinid monocots is primarily supported by modern molecular techniques, which have transformed the study of plant phylogeny since the early 1990s.1

Unlike older classification systems, such as the one proposed by Arthur Cronquist, which relied heavily on morphological, chemical, and anatomical characters, the current understanding of plant relationships is based on robust data derived from sequencing segments of DNA from plant cell nuclei and chloroplasts.1

These molecular analyses, which form the basis of the Angiosperm Phylogeny Group (APG) system, have allowed botanists to organize flowering plants into more accurate, monophyletic groups. Within this framework, Pandanales is classified as a non-commelinid order, distinct from the four related orders that comprise the commelinids (Arecales, Commelinales, Poales, and Zingiberales).1