''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the

Arabian Peninsula The Arabian Peninsula, (; ar, شِبْهُ الْجَزِيرَةِ الْعَرَبِيَّة, , "Arabian Peninsula" or , , "Island of the Arabs") or Arabia, is a peninsula of Western Asia, situated northeast of Africa on the Arabian Plate ...

Description

Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely

shrub A shrub (often also called a bush) is a small-to-medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees ...

s or shrubby. Their leaves are variable between and within species. The inflorescences are long narrow

raceme A raceme ( or ) or racemoid is an unbranched, indeterminate type of inflorescence bearing flowers having short floral stalks along the shoots that bear the flowers. The oldest flowers grow close to the base and new flowers are produced as the s ...

s with bundles (fascicles) of flowers, usually one to five, but sometimes up to 15. The flowers are polygamous (i.e. there are male, female and bisexual flowers on the same plant). There are usually five tepals, arranged spirally, fused at the base to form a tube, longer in female flowers than in male ones. The eight stamens are joined at the base, with patches of nectar-bearing tissue at the base of the inner whorl. The fruit is in the form of an

achene An achene (; ), also sometimes called akene and occasionally achenium or achenocarp, is a type of simple dry fruit produced by many species of flowering plants. Achenes are monocarpellate (formed from one carpel) and indehiscent (they do not ope ...

, usually three-angled, often with rows of spinelike structures.

Taxonomy

The genus ''Oxygonum'' was first published in 1819 by Francisco Campderá, who attributed the name to William John Burchell. ''Oxygonum'' is placed in the tribe Oxygoneae of the subfamily Polygonoideae; it is the only genus in the tribe. A 2015 molecular phylogenetic study suggested that it was the sister of all the remaining tribes.

Species

Plants of the World Online Plants of the World Online (POWO) is an online database published by the Royal Botanic Gardens, Kew. It was launched in March 2017 with the ultimate aim being "to enable users to access information on all the world's known seed-bearing plants by ...

accepted the following species: *''

Oxygonum acetosella ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Welw. *''

Oxygonum alatum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Burch. *''

Oxygonum altissimum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Germish. *''

Oxygonum annuum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' S.Ortiz & Paiva *''

Oxygonum atriplicifolium ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' (Meisn.) Martelli *''

Oxygonum auriculatum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' R.A.Graham *''

Oxygonum buchananii ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' (Dammer) J.B.Gillett *''

Oxygonum carnosum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' R.A.Graham *''

Oxygonum delagoense ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Kuntze *''

Oxygonum dregeanum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Meisn. *''

Oxygonum ellipticum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' R.A.Graham *''

Oxygonum fruticosum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Dammer ex Milne-Redh. *''

Oxygonum gramineum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' R.A.Graham *''

Oxygonum hastatum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' S.Ortiz *''

Oxygonum hirtum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more ...

'' Peter *''

Oxygonum leptopus ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Mildbr. *''

Oxygonum limbatum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' R.A.Graham *''

Oxygonum lineare ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' De Wild. *''

Oxygonum litorale ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' R.A.Graham *''

Oxygonum lobatum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' R.A.Graham *''

Oxygonum maculatum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' R.A.Graham *''

Oxygonum magdalenae ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Dammer ex Peter *''

Oxygonum ovalifolium ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Robyns & E.Petit *''

Oxygonum overlaetii ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Robyns *''

Oxygonum pachybasis ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Milne-Redh. *''

Oxygonum pterocarpum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Osborne & Vollesen *''

Oxygonum quarrei ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' De Wild. *''

Oxygonum robustum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Germish. *''

Oxygonum sagittatum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' R.A.Graham *''

Oxygonum salicifolium ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Dammer *''

Oxygonum schliebenii ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Mildbr. *''

Oxygonum sinuatum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' (Hochst. & Steud. ex Meisn.) Dammer *''

Oxygonum stuhlmannii ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Dammer *''

Oxygonum subfastigiatum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' R.A.Graham *''

Oxygonum tenerum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' Milne-Redh. *''

Oxygonum thulinianum ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are annual or perennial herbaceous plants, more rarely ...

'' S.Ortiz *''

Oxygonum wittei ''Oxygonum'' is a genus of plants in the family Polygonaceae with about 30 species. It is native to eastern parts of Africa and to the Arabian Peninsula. Description Species of ''Oxygonum'' are Annual plant, annual or Perennial plant, perennial ...

'' Staner

References

{{Taxonbar, from=Q7115979 Polygonaceae genera Polygonoideae