Petrosaviaceae is a
family of
flowering plants belonging to a
monotypic order, Petrosaviales. Petrosaviales are
monocots, and are grouped within the
lilioid monocots. Petrosaviales are a very small order (1 family, 2 genera, about 5 species) of rare leafless achlorophyllous,
mycoheterotrophic plants found in dark
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.