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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Ordo: Caryophyllales

Familia: Polygonaceae
Subfamilia: Polygonoideae
Tribus: Rumiceae
Genus: Oxyria
Species: O. caucasica – O. digyna – O. sinensis

Oxyria Hill, Veg. Syst. 10. 24. pl. 24 (1765).

Type species: Oxyria digyna (L.) Hill., Hort. Kew. 158 (1768).

Primary references

Hill, J. 1765. The Vegetable System. Or, the internal structure and the life of plants; their parts, and nourishment, explained; their classes, orders, genera, and species, ascertained, and described; in a method altogether new: comprehending an artificial index and a natural system. 10: 24, pl. 24, f. 2.


Hassler, M. 2017. Oxyria. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2017. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2017 Oct. 3. Reference page.
International Plant Names Index. 2017. Oxyria. Published online. Accessed: Mar. 20 2017.
Tropicos.org 2017. Oxyria. Missouri Botanical Garden. Published on the internet. Accessed: 2017 Mar. 20.

Vernacular names
suomi: Haprot

Oxyria is a genus of plants in the family Polygonaceae with three accepted species as of March 2019. It has a circumboreal distribution.


Species of Oxyria are perennial herbaceous plants or weakly shrubby. They may have rhizomes. Their stems are erect, variably branched. Undivided leaves are present both at the base of the plant and on the stems. They are arranged alternately and have stalks (petioles). The ocrea is tubular and membranous. The inflorescences are terminal, paniclelike or racemelike, borne on stems (pedunculate). Individual flowers are either bisexual or unisexual, with four greenish to reddish brown tepals. The fruits are in the form of achenes with broadly winged margins.[2][3]

The genus was first described by John Hill in 1765.[4] It is placed in the subfamily Polygonoideae, tribe Rumiceae, along with Rheum and Rumex. It is sister to the clade formed by the other two species.[5]






As of March 2019, Plants of the World Online accepted the following species:[1]

Oxyria caucasica Chrtek & Šourková
Oxyria digyna (L.) Hill
Oxyria sinensis Hemsl.


"Oxyria Hill". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2019-03-09.
Freeman, Craig C. & Packer, John G. "Oxyria". In Flora of North America Editorial Committee (ed.). Flora of North America (online). eFloras.org. Retrieved 2019-03-17.
Li, Anjen & Grabovskaya-Borodina, Alisa E. "Oxyria". In Wu, Zhengyi; Raven, Peter H. & Hong, Deyuan (eds.). Flora of China (online). eFloras.org. Retrieved 2019-03-17.
"Plant Name Details for Oxyria Hill". The International Plant Names Index. Retrieved 2019-03-09.
Schuster, Tanja M.; Reveal, James L.; Bayly, Michael J. & Kron, Kathleen A. (2015). "An updated molecular phylogeny of Polygonoideae (Polygonaceae): Relationships of Oxygonum, Pteroxygonum, and Rumex, and a new circumscription of Koenigia". Taxon. 64 (6): 1188–1208. doi:10.12705/646.5.

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