Systematics
The circumscription of Triuridaceae has been unstable and some taxa may be paraphyletic.
Triuridaceae have been allied with Alismataceae (based on the free carpels) but the APG III system (2009) places them among the non-commelinid monocots, in the Order Pandanales.
The genus Lacandonia is sometimes placed in its own family, Lacandoniaceae.
Triuridaceae are included in the Kew Royal Botanical Garden World Checklist of Selected Plant Families and were reviewed by H. Maas-van de Kamer and P. Maas-van de Kamer in 2005. In this list, the genera Andruris and Hyalisma are subsumed into Sciaphila and Hexuris is subsumed into Peltophyllum, but two new genera Kupea and Kihansia are included. Both genera were described (and placed in Triuridaceae) in 2003. The included genera are:
- Kihansia Cheek
- Kupea Cheek & S.A.Williams
- Lacandonia E.MartÃnez & Ramos
- Peltophyllum Gardner (syn. Hexuris Miers)
- Sciaphila Blume (syn. Hyalisma Champion)
- Seychellaria Hemsl.
- Soridium Miers
- Triuridopsis H.Maas & Maas
- Triuris Miers
However, APG III, following the Vascular Plant Families and Genera database also housed at Kew Royal Botanical Gardens, recognizes the following genera:
- Andruris Schltr.
- Hexuris Miers(SUS) = Peltophyllum Gardner
- Hyalisma Champ. = Sciaphila Blume
- Lacandonia E.Martinez & Ramos = Triuris Miers
- Peltophyllum Gardner
- Sciaphila Blume
- Seychellaria Hemsl.
- Soridium Miers
- Triuris Miers
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