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This species is accepted, and its native range is Zambia.

[FZ]

Flora Zambesiaca. Vol. 9, Part 3. Polygonaceae-Myriaceae. Pope GV, Polhill RM, Martins ES. 2006.

Habit
An erect annual herb An erect annual herb.
Stem
Stems branching at the base and laxly above, angular-striate, greenish, reddish at the base, with simple white hairs at the base and to a varying extent above Stems branching at the base and laxly above, angular-striate, greenish, reddish at the base, with simple white hairs at the base and to a varying extent above.
Leaves
Leaves greenish, (8)20–30(60) × 0.3–0.7(1) mm, narrowly linear, glabrous or with simple white hairs Leaves greenish, (8)20–30(60) × 0.3–0.7(1) mm, narrowly linear, glabrous or with simple white hairs.
Ocrea
Ocrea (4)5–6(9) mm long, often 3–4 dentate at the apex, surface glabrous or somewhat pubescent, apex glabrous or with a fringe of c. 0.2 mm long hairs Ocrea (4)5–6(9) mm long, often 3–4 dentate at the apex, surface glabrous or somewhat pubescent, apex glabrous or with a fringe of c. 0.2 mm long hairs.
Flowers
Hermaphrodite flowers homostylous or not conspicuously heterostylous; perianth 5-lobed; tube 0.5–1 mm long, pubescent; lobes 1–2(2.5) mm long, white, tinged with pink at the abaxial surface, sometimes pubescent Male flowers not seen Flowers pedicellate, 3(4) in the axils of bracts, 1(2) flowering at a time, arranged in terminal spiciform, slender racemes up to 21 cm long; bracts up to 5 mm long, truncate, sometimes with a acuminate apex up to 1 mm long, glabrous to pubescent, with short apical cilia; pedicels erect, up to 5 mm long, filiform Flowers pedicellate, 3(4) in the axils of bracts, 1(2) flowering at a time, arranged in terminal spiciform, slender racemes up to 21 cm long; bracts up to 5 mm long, truncate, sometimes with a acuminate apex up to 1 mm long, glabrous to pubescent, with short apical cilia; pedicels erect, up to 5 mm long, filiform. Hermaphrodite flowers homostylous or not conspicuously heterostylous; perianth 5-lobed; tube 0.5–1 mm long, pubescent; lobes 1–2(2.5) mm long, white, tinged with pink at the abaxial surface, sometimes pubescent. Male flowers not seen.
Filaments
Filaments 0.5–1.5 mm long; anthers 0.5–0.7 mm long
Ovary
Ovary c. 1 mm long; styles c. 1.5 mm long
Ecology
Sandy roadsides, Guibourtia and Baikiaea woodland, Kalahari Sand; c. 1000–1100 m.
Note
The most similar species to O. annuum is O. lineare De Wild., from Dem. Rep. Congo and Angola, which likewise has linear leaves and ellipsoid fruits; however this species can be easily differentiated from O. annuum since it often has stems glabrous at the base, wider leaves ((0.5)1–2.3(9) mm) that are linear to elliptic, more flowers per bract ((4)6–14), the entire corolla always glabrous, longer corolla lobes (2.5–3(3.5) mm), wider fruits (2.5–3(3.5) mm), markedly heterostylous flowers and fruits without transverse wrinkles.
Distribution
ZAM B, ZAM W Zambia Also in Angola.
Male
Male flowers not seen.
Stamens
Filaments 0.5–1.5 mm long; anthers 0.5–0.7 mm long.
Pistil
Ovary c. 1 mm long; styles c. 1.5 mm long.
Hermaphrodite
Ovary c. 1 mm long; styles c. 1.5 mm long. Filaments 0.5–1.5 mm long; anthers 0.5–0.7 mm long. Hermaphrodite flowers homostylous or not conspicuously heterostylous; perianth 5-lobed; tube 0.5–1 mm long, pubescent; lobes 1–2(2.5) mm long, white, tinged with pink at the abaxial surface, sometimes pubescent.
Fruits
Nut 4–5 × 2.3–2.5 mm, ellipsoid, with c. 12 longitudinal ridges and numerous transverse wrinkles, glabrous or pubescent. Nut 4–5 × 2.3–2.5 mm, ellipsoid, with c. 12 longitudinal ridges and numerous transverse wrinkles, glabrous or pubescent.

Native to:

Angola

Oxygonum annuum S.Ortiz & Paiva appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 1998 Robinson, E. A. [6792], Zambia K000244020 holotype

First published in Bot. J. Linn. Soc. 131: 172 (1999)

Accepted by

  • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.

Literature

Flora Zambesiaca

  • Bot. J. Linn. Soc. 131: 172 (1999).

Kew Backbone Distributions

  • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.

Flora Zambesiaca
Flora Zambesiaca
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens
'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0