1. Family: Polygonaceae Juss.
    1. Genus: Oxygonum Burch. ex Campd.
      1. Oxygonum delagoense Kuntze

        This species is accepted, and its native range is Tanzania to S. Africa.

    [FZ]

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

    Type
    Type:Mozambique, Delagoa Bay, Kuntze s.n. (NY, holotype; K).
    Habit
    An erect or ascending, annual or short-lived perennial herb with a taproot, generally branching from the base An erect or ascending, annual or short-lived perennial herb with a taproot, generally branching from the base.
    Stem
    Stems reddish-brown, up to 1 m tall, branched, longitudinally striate, glabrous to pubescent; branches slender, papillose Stems reddish-brown, up to 1 m tall, branched, longitudinally striate, glabrous to pubescent; branches slender, papillose.
    Leaves
    Leaves 2–8 × 0.3–1.8 cm, narrowly elliptic.lanceolate or linear-lanceolate to lanceolate, acute and mucronate at the apex, attenuate or decurrent at the base, ± sinuous or with 1–3 pairs of forward-directed lobes on the margins, sometimes very asymmetrical; midrib prominent beneath and ± puberulous or glabrous Leaves 2–8 × 0.3–1.8 cm, narrowly elliptic-lanceolate or linear-lanceolate to lanceolate, acute and mucronate at the apex, attenuate or decurrent at the base, ± sinuous or with 1–3 pairs of forward-directed lobes on the margins, sometimes very asymmetrical; midrib prominent beneath and ± puberulous or glabrous.
    Ocrea
    Ocrea 4–6 mm long, truncate with a fringe of light brown setae 4–5 mm long at the apex Ocrea 4–6 mm long, truncate with a fringe of light brown setae 4–5 mm long at the apex.
    Flowers
    Flowers pedicellate, 2–4(6) in the axils of bracts, arranged in lax terminal slender racemes up to 30 cm long; bracts up to 4 mm long, chartaceous, obliquely truncate, without a fringe of setae or sometimes with a fringe of setae up to 3 mm long; pedicels 5–7 mm long, erect, glabrous or puberulous Hermaphrodite flowers heterostylous; perianth white, greenish or pale pink, lobed; tube 1.75–2.3 mm long and densely pubescent outside; lobes 3–4 mm long, oblong, ± acute Male flowers present; perianth c. 5 mm long; lobes 2–2.5 mm long; filaments 2.5–3 mm long Flowers pedicellate, 2–4(6) in the axils of bracts, arranged in lax terminal slender racemes up to 30 cm long; bracts up to 4 mm long, chartaceous, obliquely truncate, without a fringe of setae or sometimes with a fringe of setae up to 3 mm long; pedicels 5–7 mm long, erect, glabrous or puberulous. Hermaphrodite flowers heterostylous; perianth white, greenish or pale pink, lobed; tube 1.75–2.3 mm long and densely pubescent outside; lobes 3–4 mm long, oblong, ± acute. Male flowers present; perianth c. 5 mm long; lobes 2–2.5 mm long; filaments 2.5–3 mm long.
    Filaments
    Filaments 1–4.5 mm long, filiform; anthers 0.4–0.5 × 0.25 mm
    Ovary
    Ovary 1 × 0.5 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 5–6 mm long, triquetrous, ± conical, usually armed a little above the base with 3 small, sometimes minute, ± retrorse teeth or protuberances at the angles. Nut 5–6 mm long, triquetrous, ± conical, usually armed a little above the base with 3 small, sometimes minute, ± retrorse teeth or protuberances at the angles.
    Ecology
    In open grassland and in sandy soils at water edges; 20–1200 m.
    Distribution
    Zimbabwe BOT N, BOT W, BOT SE, ZIM W, ZIM C, ZIM S, MOZ N Botswana MOZ M Also in Tanzania, Angola, Namibia and South Africa. MOZ GI Mozambique
    Male
    Male flowers present; perianth c. 5 mm long; lobes 2–2.5 mm long; filaments 2.5–3 mm long.
    Stamens
    Filaments 1–4.5 mm long, filiform; anthers 0.4–0.5 × 0.25 mm.
    Pistil
    Ovary 1 × 0.5 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 1 × 0.5 mm; styles of the long-styled flowers 3–3.5 mm long; styles of the short-styled flowers 1–3.5 mm long. Filaments 1–4.5 mm long, filiform; anthers 0.4–0.5 × 0.25 mm. Hermaphrodite flowers heterostylous; perianth white, greenish or pale pink, lobed; tube 1.75–2.3 mm long and densely pubescent outside; lobes 3–4 mm long, oblong, ± acute.
    [FTEA]

    Polygonaceae, R. A. Graham. Flora of Tropical East Africa. 1958

    Habit
    An erect or ascending herb.
    Stem
    Stems up to 1 m. tall, glabrous to pubescent, reddish-brown.
    Ocrea
    Ocreae 4–6 mm. long, pubescent, membranous, truncate, with a terminal fringe of ± light-brown, erect-patent setae 4–5 mm. long.
    Leaves
    Leaves 2–8 cm. long, often less than 8 mm. broad but up to 1.8 cm., basally decurrent, narrowly elliptic-lanceolate or linear-lanceolate to lanceolate or lanceolate-elliptic, apically acute, mucronate, entire, the margins sinuous, or with 1–3 pairs of forward-directed lobes, sometimes very asymmetrical, puberulent or not on the midrib.
    Inflorescences
    Inflorescence elongated, probably up to 30 cm.
    Bracts
    Bracts 4 mm. long, 1–2.5 (–3) cm. apart, pubescent, with or (commonly) without a fringe of setae.
    Pedicel
    Pedicels 2–4 (–6) together, not exceeding the bracts by more than 3 mm., erect, glabrous or puberulous.
    Flowers
    Flowers white, 4.75–6 mm. long.
    Tepal
    Tepals 3–3.75 mm. long.
    Style
    Short styles probably 1.5–2.5 mm. long, free to the base or up to 1 mm. connate.
    Filaments
    Filaments 1–4.5 mm. long.
    Fruits
    Fruit 5 (–6) mm. long, pubescent, otherwise smooth, conical, usually armed a little above the base with three small (sometimes scarcely perceptible) ± retrorse teeth or protuberances at the angles.
    Habitat
    Roadsides, disturbed and weedy ground, and in crops (maize)
    Distribution
    T6 also elsewhere in southern and particularly in coastal SE. Africa

    Distribution

    Native to:

    Angola, Botswana, Cape Provinces, KwaZulu-Natal, Mozambique, Namibia, Northern Provinces, Swaziland, Tanzania, Zambia, Zimbabwe

    Oxygonum delagoense Kuntze appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Aug 29, 2013 Bingham, M.G. [13151], Zambia K000014446
    Sep 1, 2005 Hochobes, M.M. [MH1212], Namibia K000449603
    Sep 1, 2005 Hochobes, M.M. [MH1233], Namibia K000449604
    Jan 1, 1987 Scott Elliot, G.F. [8365], Tanzania K000244025 holotype
    Kuntze, O. [s.n.], Mozambique K000244024 isotype

    First published in Revis. Gen. Pl. 3(2): 268 (1898)

    Accepted by

    • Schuster, T.M., Reveal, J.L., Bayly, M.J. & Kron, K.A. (2015). An updated molecular phylogeny of Polygonoideae (Polygonaceae): relationships of Oxygonum, Pteroxygonum, and Rumex, and a new circumscription of Koenigia Taxon 64: 1188-1208.
    • 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.
    • Graham, R.A. (1958). Flora of Tropical East Africa, Polygonaceae: 1-40.

    Literature

    Flora Zambesiaca
    • Prodr. Fl. SW. Afrika, fam. 23: 4 (1969).
    • F.T.E.A., Polygonaceae: 30 (1958).
    • Kew Bull. 12: 164 (1957)
    • F.C. 5, 1: 461 (1912).
    • F.T.A. 6, 1: 100 (1909).
    • Revis. Gen. Pl. 3, 3: 268 (1898).
    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.
    • Germishuizen, G. & Meyer, N.L. (eds.) (2003). Plants of Southern Africa an annotated checklist Strelitzia 14: 1-1231. National Botanical Institute, Pretoria.
    Flora of Tropical East Africa
    • C. H. Wright in Fl. Cap. 5 (1): 461 (1912).
    • Baker & C.H. Wright in Flora of Tropical Africa 6 (1): 100 (1909).
    • Kuntze, Rev. Gen. Pl. 3: 268 (1898).

    Sources

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

    Flora of Tropical East Africa
    Flora of Tropical East Africa
    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 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