Petrosaviales is a very small order composed of one family, two genera and four species accepted in 2016.

[2] Some species are photosynthetic (Japonolirion) and others are rare, leafless, chlorophyllous, mycoheterotrophic plants (Petrosavia).

The family is found in low-light montane rainforests in Japan, China, Southeast Asia and Borneo.

They are characterised by having bracteate racemes, pedicellate flowers, six persistent tepals, septal nectaries, three almost-distinct carpels, simultaneous microsporogenesis, monosulcate pollen, and follicular fruit.

The APG II system recognized the family and assigned it to the clade monocots, unplaced as to order.