Oxyria

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

Oxyria
Oxyria digyna near Upernavik, Greenland.
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Polygonaceae
Subfamily: Polygonoideae
Genus: Oxyria
Hill[1]
Species

See text.

Synonyms[1]
  • Donia R.Br.

Description

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]

Taxonomy

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]

Rumiceae
 

Oxyria

 
 
 

Rumex

 
 

Rheum

 
 
 

Species

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.

References
  1. "Oxyria Hill". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2019-03-09.
  2. 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.
  3. 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.
  4. "Plant Name Details for Oxyria Hill". The International Plant Names Index. Retrieved 2019-03-09.
  5. 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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