Petrosaviaceae is a family of flowering plants belonging to a monotypic order, Petrosaviales. Petrosaviales are monocots, and are grouped within the lilioid monocots. Petrosaviales is a very small order – one family, two genera and four species were accepted in 2016 – [2]) of photosynthetic (Japonolirion) and rare, leafless, achlorophyllous, mycoheterotrophic plants (Petrosavia), 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.[3]
The family has only been recognized in modern classifications; previously, the family members were typically treated as belonging to the Liliaceae. The APG II system recognized the family and assigned it to the clade monocots, unplaced as to order. The APG III system of 2009 and the APG IV system of 2016 placed family Petrosaviaceae in order Petrosaviales.[1][4]
As of June 2016, two genera are accepted by the World Checklist of Selected Plant Families:[5]
The plants in both genera are found in high-elevation habitats.
{{cite journal}}: CS1 maint: uses authors parameter (link) Petrosaviaceae is a family of flowering plants belonging to a monotypic order, Petrosaviales. Petrosaviales are monocots, and are grouped within the lilioid monocots. Petrosaviales is a very small order – one family, two genera and four species were accepted in 2016 – ) of photosynthetic (Japonolirion) and rare, leafless, achlorophyllous, mycoheterotrophic plants (Petrosavia), 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.
