Petrosaviaceae are family of flowering plants. Although the Petrosaviaceae have been identified as monocots, the family's relationship to the other monocot orders is unclear. The family includes two genera, Petrosavia and Japonolirion. Until recently, Japonolirion was assigned to its own monogeneric family, Japonoliriaceae, but recent DNA analysis revealed a close relationship with Petrosavia, and Japonolirion was assigned to the family. Both genera are native to high-elevation habitats and have bracteate racemes, pedicellate flowers, six persistent tepals, septal nectaries, three nearly distinct carpels, simultaneous microsporogenesis, monosulcate pollen, and follicular fruits.
If the Petrosaviaceae are not assigned to another monocot order, then the monofamilial order Petrosaviales would be recognized.
At one point there were various distinct orders, but it seems they tended to be polyphyletic[?], and so the whole group has been mushed into a single order.
The Triuridaceae[?] and Petrosaviaceae[?] have been placed here, but there actual affinities are not so clear.
The alismatids as are the sister group of the Arales and the latter have sometimes been included here.
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