Species of Knorringia are perennialherbaceous 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]
Taxonomyedit
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]
^ abc"Knorringia (Czukav) Tzvelev", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2019-03-09
^ abHong, 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
^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
January 01, 1970
knorringia, genus, plants, family, polygonaceae, native, central, asia, siberia, scientific, classification, kingdom, plantae, clade, tracheophytes, clade, angiosperms, clade, eudicots, order, caryophyllales, family, polygonaceae, subfamily, polygonoideae, gen. Knorringia is a genus of plants in the family Polygonaceae It is native to Central Asia and Siberia 1 Knorringia Scientific classification Kingdom Plantae Clade Tracheophytes Clade Angiosperms Clade Eudicots Order Caryophyllales Family Polygonaceae Subfamily Polygonoideae Genus Knorringia Czukav Tzvelev 1 Contents 1 Description 2 Taxonomy 2 1 Species 3 ReferencesDescription editSpecies 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 editIn 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 edit As of March 2019 update Plants of the World Online accepted the following species 1 Knorringia pamirica Korsh Tzvelev Knorringia sibirica Laxm TzvelevReferences edit a b c Knorringia Czukav Tzvelev Plants of the World Online Royal Botanic Gardens Kew retrieved 2019 03 09 a b 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 amp 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 Retrieved from https en wikipedia org w index php title Knorringia amp oldid 1139851128, wikipedia, wiki, book, books, library,
