Knorringia

Classification System: APG IV

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

Familia: Polygonaceae
Subfamilia: Polygonoideae
Tribus: Polygoneae
Genus: Knorringia
Species: K. pamirica – K. sibirica
Name

Knorringia (Czukav.) Tzvelev, Novosti Sist. Vyssh. Rast. 24: 76. (1987)

Type species: Knorringia sibirica (Laxm.) Tzvelev, Novosti Sist. Vyssh. Rast. 24: 76. (1987)

Synonyms

Basionym
Polygonum sect. Knorringia Czukav., Novosti Sist. Vyssh. Rast. 1966: 93 (1966).
Homotypic
Aconogonon sect. Knorringia (Czukav.) Soják, Preslia 46(2): 151 (1974).

References
Primary references

Tzvelev, N.N. 1987. Novosti Sistematiki Vysshchikh Rastenii 24: 76.

Additional references

Schuster, T.M., Reveal, J.L., Bayly, M.J. & Kron, K.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 JSTOR ResearchGate Reference page.

Links

Govaerts, R. et al. 2022. Knorringia in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2022 Jan 2. Reference page.
International Plant Names Index. 2017. Knorringia. Published online. Accessed: Mar. 29 2017.
Tropicos.org 2017. Knorringia. Missouri Botanical Garden. Published on the internet. Accessed: 2017 Mar. 29.

Knorringia is a genus of plants in the family Polygonaceae. It is native to Central Asia and Siberia.[1]

Description

Species of Knorringia are perennial herbaceous plants growing to about 40 cm (16 in) tall from a slender, often branched rhizome. The stem may be more-or-less upright or decumbent. The leaves are arranged alternately, usually lobed, carried on a short five-sided leaf stalk (petiole) with two distinct wings. The ochreas are 3–20 mm (0.1–0.8 in) long, and form membranous tubes that partly or fully wrap around the stem. The inflorescence is either a panicle made up of a few racemes or a single raceme. The flowers usually have five greenish-white tepals and eight stamens, included within the flower. They are either bisexual or have the gynoecium poorly developed. The fruits are in the form of achenes. The seeds have a thick outer layer (exotesta) and a very thin inner layer (endotesta).[2]
Taxonomy

In 1966, Anna Czukavina created a section within the genus Polygonum, P. sect. Knorringia. The section was raised to the rank of genus in 1987 by Nikolai Tzvelev,[3] and independently in 1989 by Suk-Pyo Hong.[2] The genus is placed in the tribe Polygoneae in the subfamily Polygonoideae. A 2015 molecular phylogenetic study suggested that it was sister to all the remaining genera in the tribe, although only K. sibirica was included in the analysis.[4]

Polygoneae	Knorringia         Polygonum ciliinode (syn. Fallopia ciliinodis)   DAP clade   Duma       Atraphaxis     Polygonum         RMF clade   Reynoutria       Muehlenbeckia     Fallopia s.s.

 
Species

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

Knorringia pamirica (Korsh.) Tzvelev
Knorringia sibirica (Laxm.) Tzvelev

References

"Knorringia (Czukav) Tzvelev", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2019-03-09
Hong, Suk-Pyo (1989), "Knorringia (= Aconogonon sect. Knorringia), a new genus in the Polygonaceae", Nordic Journal of Botany, 9 (4): 343–357, doi:10.1111/j.1756-1051.1989.tb01009.x
"Plant Name Details for Knorringia (Czukav.) Tzvelev", 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