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Petrosaviaceae
Petrosavia sakuraii
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Order:	Petrosaviales Takht.
Family:	Petrosaviaceae Hutch.
Type species
Petrosavia stellaris Becc.
Genera
Japonolirion Petrosavia

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 composed of one family, two genera and four species accepted in 2016. 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.

Taxonomy

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 the family Petrosaviaceae in the order Petrosaviales.

Genera

As of June 2016, two genera are accepted by the World Checklist of Selected Plant Families:

• Japonolirion Nakai, with one species
• Petrosavia Becc, with three species

Distribution and habitat

The plant species in both genera are found in high-elevation habitats.

References

1. ^ Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III". Botanical Journal of the Linnean Society. 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x. hdl:10654/18083.
2. Christenhusz, M. J. M. & Byng, J. W. (2016). "The number of known plants species in the world and its annual increase". Phytotaxa. 261 (3): 201–217. doi:10.11646/phytotaxa.261.3.1.
3. Cameron, Chase & Rudall 2003
4. Angiosperm Phylogeny Group (2016). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV". Botanical Journal of the Linnean Society. 181 (1): 1–20. doi:10.1111/boj.12385. ISSN 0024-4074.
5. "Search for Petrosaviaceae". World Checklist of Selected Plant Families. Royal Botanic Gardens, Kew. Retrieved 2016-06-12.

Bibliography

• Cameron, Kenneth M.; Chase, Mark W.; Rudall, Paula J. (July 2003), "Recircumscription of the monocotyledonous family Petrosaviaceae to include Japonolirion", Brittonia, 55 (3): 214–225, doi:10.1663/0007-196X(2003)055[0214:ROTMFP]2.0.CO;2, JSTOR 3218442, S2CID 39771490

External links

• Petrosavia in Flora of China
• links at CSDL, Texas
• The Plant List

• Media related to Petrosaviaceae at Wikimedia Commons
• Data related to Petrosaviaceae at Wikispecies

v t e Orders of flowering plants (APG IV)
Supergroup Plant: Bryophyta Marchantiophyta Polypodiophyta Acrogymnospermae Angiospermae
Angiosperms	Amborellales¹ Nymphaeales¹ Austrobaileyales¹ Mesangiosperms Chloranthales Ceratophyllales Magnoliids Canellales Piperales Laurales Magnoliales Monocots Acorales² Alismatales² Petrosaviales³ Dioscoreales³ Pandanales³ Liliales³ Asparagales³ Commelinids Arecales Poales Commelinales Zingiberales Eudicots Ranunculales Proteales Trochodendrales Buxales Core eudicots Gunnerales Dilleniales Superrosids Saxifragales Rosids Vitales Fabids Zygophyllales Celastrales Malpighiales Oxalidales Fabales Rosales Cucurbitales Fagales Malvids Geraniales Myrtales Crossosomatales Picramniales Sapindales Huerteales Brassicales Malvales Superasterids Berberidopsidales Santalales Caryophyllales Asterids Cornales Ericales Campanulids Aquifoliales Asterales Escalloniales Bruniales Apiales Dipsacales Paracryphiales Lamiids Icacinales Metteniusales Garryales Boraginales Gentianales Lamiales Solanales Vahliales
¹Basal angiosperms ²Alismatids ³Lilioids Category

• Monocot families
• Petrosaviales
• Taxa named by John Hutchinson (botanist)