| Knorringia | |
|---|---|
Scientific classification
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Caryophyllales |
| Family: | Polygonaceae |
| Subfamily: | Polygonoideae |
| Genus: |
Knorringia (Czukav.) Tzvelev [1] |
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 |
| ||||||||||||||||||
Species
As of March 2019 [update], Plants of the World Online accepted the following species: [1]
- Knorringia pamirica (Korsh.) Tzvelev
- Knorringia sibirica (Laxm.) Tzvelev
References
- ^ 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. & 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
| Knorringia | |
|---|---|
|
Scientific classification
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Caryophyllales |
| Family: | Polygonaceae |
| Subfamily: | Polygonoideae |
| Genus: |
Knorringia (Czukav.) Tzvelev [1] |
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 |
| ||||||||||||||||||
Species
As of March 2019 [update], Plants of the World Online accepted the following species: [1]
- Knorringia pamirica (Korsh.) Tzvelev
- Knorringia sibirica (Laxm.) Tzvelev
References
- ^ 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. & 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