1. Family: Polygonaceae Juss.
    1. Genus: Oxygonum Burch. ex Campd.
      1. Oxygonum alatum Burch.

        This species is accepted, and its native range is Angola to S. Arrica.

    [FZ]

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

    Type
    Type from South Africa (Northern Cape Province).
    Habit
    A spreading prostrate semi-erect or erect, fleshy annual herb A spreading prostrate semi-erect or erect, fleshy annual herb.
    Stem
    Stems pinkish to reddish-purple, up to 50 cm tall, much branched from the base, longitudinally ridged, sparsely to densely covered with white cup-shaped and/or elongated scales Stems pinkish to reddish-purple, up to 50 cm tall, much branched from the base, longitudinally ridged, sparsely to densely covered with white cup-shaped and/or elongated scales.
    Leaves
    Leaves fleshy, (14)17–85(125) × (2)4–25 mm, ovate to lanceolate sometimes rhomboid, acute at the apex, attenuate below into a short petiole, entire or shallowly to deeply lobed, the lobes usually further divided, midrib prominent on the undersurface Leaves fleshy, (14)17–85(125) × (2)4–25 mm, ovate to lanceolate sometimes rhomboid, acute at the apex, attenuate below into a short petiole, entire or shallowly to deeply lobed, the lobes usually further divided, midrib prominent on the undersurface.
    Ocrea
    Ocrea greenish-white, membranous, up to 1 cm long, funnel-shaped, glabrescent or covered with cup-shaped and/or elongated scales, truncate and fringed at the apex with red or white rigid setae 2–3.5 mm long, lobed or sometimes entire Ocrea greenish-white, membranous, up to 1 cm long, funnel-shaped, glabrescent or covered with cup-shaped and/or elongated scales, truncate and fringed at the apex with red or white rigid setae 2–3.5 mm long, lobed or sometimes entire.
    Flowers
    Male flowers present; perianth 4–5 mm long; lobes 1–2 mm long; filaments 3–3.5 mm long Flowers pedicellate, 2–4 in the axils of bracts, arranged in lax terminal and axillary spiciform racemes 10–25(30) cm long; bracts membranous, 4–5 mm long, obliquely truncate and produced dorsally into a subulate seta 1–2 mm long; pedicels up to 7 mm long, pubescent or with cup-shaped and/or elongated scales Hermaphrodite flowers heterostylous; perianth pink or white, 5-lobed; tube c. 5 mm long; lobes 5–7 mm long and ovate-lanceolate Flowers pedicellate, 2–4 in the axils of bracts, arranged in lax terminal and axillary spiciform racemes 10–25(30) cm long; bracts membranous, 4–5 mm long, obliquely truncate and produced dorsally into a subulate seta 1–2 mm long; pedicels up to 7 mm long, pubescent or with cup-shaped and/or elongated scales. Male flowers present; perianth 4–5 mm long; lobes 1–2 mm long; filaments 3–3.5 mm long. Hermaphrodite flowers heterostylous; perianth pink or white, 5-lobed; tube c. 5 mm long; lobes 5–7 mm long and ovate-lanceolate.
    Filaments
    Filaments 1.5–4 mm long, with a ring of cilia near the base; anthers grey-blue to blackish, 0.5–1 × 0.3–0.5 mm
    Ovary
    Ovary 5–7 × 1–1.5 mm; styles of the long-styled flowers 3–3.5 mm long; styles of the short-styled flowers 1–3.5 mm long
    Fruits
    Nut red or yellow-brown, (9)10–13 × 9–11 mm, trigonous, winged or not at the angles, sometimes with small spreading prickles in the lower one third, glabrous or with a few scattered cup-shaped and/or elongated scales. Nut red or yellow-brown, (9)10–13 × 9–11 mm, trigonous, winged or not at the angles, sometimes with small spreading prickles in the lower one third, glabrous or with a few scattered cup-shaped and/or elongated scales.
    Note
    Cup shaped scales found on all parts of the plant, elongated scales absent.
    Ecology
    In low rainfall areas, in gravel, stony or sandy soils and in disturbed places such as roadsides; 900–1250 m.
    Distribution
    Also in southern Angola, Namibia and South Africa (North-West Province and Northern Cape Province).
    Male
    Male flowers present; perianth 4–5 mm long; lobes 1–2 mm long; filaments 3–3.5 mm long.
    Stamens
    Filaments 1.5–4 mm long, with a ring of cilia near the base; anthers grey-blue to blackish, 0.5–1 × 0.3–0.5 mm.
    Pistil
    Ovary 5–7 × 1–1.5 mm; styles of the long-styled flowers 3–3.5 mm long; styles of the short-styled flowers 1–3.5 mm long.
    Hermaphrodite
    Ovary 5–7 × 1–1.5 mm; styles of the long-styled flowers 3–3.5 mm long; styles of the short-styled flowers 1–3.5 mm long. Filaments 1.5–4 mm long, with a ring of cilia near the base; anthers grey-blue to blackish, 0.5–1 × 0.3–0.5 mm. Hermaphrodite flowers heterostylous; perianth pink or white, 5-lobed; tube c. 5 mm long; lobes 5–7 mm long and ovate-lanceolate.

    Images

    Distribution

    Native to:

    Angola, Botswana, Cape Provinces, Namibia, Northern Provinces

    Oxygonum alatum Burch. appears in other Kew resources:

    First published in Trav. S. Africa 1: 548 (1822)

    Accepted by

    • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
    • Pope, G.V., Polhill, R.M. & Martins, E.S. (eds.) (2006). Flora Zambesiaca 9(3): 1-277. Royal Botanic Gardens, Kew.
    • Germishuizen, G. & Meyer, N.L. (eds.) (2003). Plants of Southern Africa an annotated checklist Strelitzia 14: 1-1231. National Botanical Institute, Pretoria.

    Literature

    Flora Zambesiaca
    • M. Phillips, Guide Arable Weeds Botswana: 92, photo. (1991).
    • Bothalia 17: 185 (1987).
    • Prodr. Fl. SW. Afrika, fam. 23: 3 (1969).
    • Kew Bull. 12: 165 (1957).
    • Burtt Davy, Fl. Pl. Ferns Transvaal, part 1: 167 (1926).
    • Trans. Roy. Soc. South Africa 5: 346 (1916).
    • F.C. 5, 1: 460 (1912).
    • F.T.A. 6, 1: 99 (1909).
    • Hiern, Cat. Afr. Pl. Welw. 1, 4: 902 (1900).
    • Trav. South. Africa 1: 548 (1822).
    Kew Backbone Distributions
    • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
    • Pope, G.V., Polhill, R.M. & Martins, E.S. (eds.) (2006). Flora Zambesiaca 9(3): 1-277. Royal Botanic Gardens, Kew.

    Sources

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

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2020. 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 2020. 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

    Plants and People Africa
    Common Names from Plants and People Africa http://www.plantsandpeopleafrica.com/
    © Plants and People Africa http://www.plantsandpeopleafrica.com http://creativecommons.org/licenses/by/3.0/