[2][5][6] A comparison of DNA sequences has indicated that Triantha glutinosa might be two species.

[7] Before the family Tofieldiaceae was established in 1995, Triantha and related genera were usually placed in Nartheciaceae, Liliaceae, or Melanthiaceae, but molecular phylogenetic studies of monocots and Alismatales have shown that inclusion of Triantha etc.

[8] Triantha is distinguished from Tofieldia by its glandular-pubescent stems and by the presence of seed appendages.

The species of Triantha are so closely related that the authors could not resolve any relationships among them.

[7] It was reported in August 2021 that the species Triantha occidentalis is carnivorous, catching insects with sticky hairs and enzymatic secretions on its stem.