1. Family: Polygonaceae Juss.
    1. Genus: Oxygonum Burch. ex Campd.
      1. Oxygonum dregeanum Meisn.

        This species is accepted, and its native range is E. Cape Prov. to KwaZulu-Natal.

    [FZ]

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

    Stem
    Stem erect ascending or sparingly branched or much branched from the base, slightly angular, longitudinally ridged, glabrous to puberulous or retrorsely hispidulous, up to 50 cm or more Stem erect ascending or sparingly branched or much branched from the base, slightly angular, longitudinally ridged, glabrous to puberulous or retrorsely hispidulous, up to 50 cm or more. Stem up to 50 cm tall, ± erect, rarely decumbent
    Leaves
    Leaves subsessile, linear to elliptic, lanceolate, ovate or obovate, simple to deeply linear-lobed, sometimes pinnately or bipinnately lobed, each lobe ending in a large slender tip, attenuate at the base into a short petiole Leaves subsessile, linear to elliptic, lanceolate, ovate or obovate, simple to deeply linear-lobed, sometimes pinnately or bipinnately lobed, each lobe ending in a large slender tip, attenuate at the base into a short petiole. Leaves sessile; lamina 15–65(70) × (1)2–20(26) mm, fleshy, linear, lanceolate, entire or with 3–9 lobes or pinnately or bipinnately lobed Leaves deeply divided into 3–9 lobes, with the lower lobes shallowly divided again.
    Ocrea
    Ocrea 4–8 mm long, membranous, lobed, with the lobes ending in slender setae, hairy outside Ocrea 4–8 mm long, membranous, lobed, with the lobes ending in slender setae, hairy outside. Ocrea up to 5 mm long, lobed, ± strigose outside; lobes ending in slender red setae, ± as long as the tubular part
    Flowers
    Flowers 2–4, pedicellate in the axil of bracts, arranged in terminal and lateral spiciform racemes up to 20 cm long; pedicels up to 7 mm long, articulated near the apex, glabrous or pubescent; bracts 3–4 mm long, cup-shaped, membranous, ± hairy outside Hermaphrodite flowers heterostylous; perianth tubular, 5-lobed; lobes white or pale pink, tinged with pink or wine-red Male flowers present, often solitary; filaments c. 3 mm long Flowers 2–4, pedicellate in the axil of bracts, arranged in terminal and lateral spiciform racemes up to 20 cm long; pedicels up to 7 mm long, articulated near the apex, glabrous or pubescent; bracts 3–4 mm long, cup-shaped, membranous, ± hairy outside. Flowers 1–3 in fascicles in axils of cuspidate bracts, forming a long lax raceme Hermaphrodite flowers heterostylous; perianth tubular, 5-lobed; lobes white or pale pink, tinged with pink or wine-red. Male flowers present, often solitary; filaments c. 3 mm long.
    Filaments
    Filaments 3–5 mm long, filiform; anthers c. 1 mm long, oblong, reddish-brown or blue
    Ovary
    Ovary bluntly trigonous; styles of the long-styled flowers 2.5–5.5 mm long; styles of the short-styled flowers 1–1.5(2) mm long, united for two-thirds of their length
    Fruits
    Nut 7–12 × 2–4 mm, ovoid-oblong, broadest below the middle, trigonous, longitudinally ridged, wrinkled between the ridges, sometimes with small spines, blunt teeth or wings on the angles near the base, glabrous to puberulous. Nut 7–12 × 2–4 mm, ovoid-oblong, broadest below the middle, trigonous, longitudinally ridged, wrinkled between the ridges, sometimes with small spines, blunt teeth or wings on the angles near the base, glabrous to puberulous. Nut 10 × 5 mm, ovoid, sometimes with a spine one-third of the way from the base, slightly puberulous.
    Note
    This complex is very variable, varying in habit, size, shape and divisions of leaf, fringes of the ocrea, size and colour of flowers, degree of polygamy, shape of fruit, etc. We follow the treatment given by Germishuizen in Bothalia 18: 173–181 (1988). Subsp. dregeanum is restricted to the coast and midlands of KwaZulu-Natal and adjacent parts of the Eastern Cape Province (Transkei).
    Habit
    Perennial ± erect herb; leaves 25–40 × 2–5 mm, linear to narrowly elliptic, entire on the margins, rarely with very rudimentary lobes near the base; inflorescence a long slender terminal or axillary raceme Short or long and robust perennial herb, arising from a woody rootstock. Perennial herb much branched from a thick vertical woody stock Short or long and robust perennial herb, arising from a woody rootstock
    Ecology
    Banks of water courses, grasslands, sandy and dry soils; c. 1100–1400 m.
    Distribution
    BOT N, ZIM W, ZIM C, ZIM E, ZIM S Botswana Also in South Africa (Northern Cape, North-West, Limpopo, Gauteng, Mpumalanga and Free State Provinces). Zimbabwe
    Male
    Male flowers present, often solitary; filaments c. 3 mm long.
    Hermaphrodite
    Hermaphrodite flowers heterostylous; perianth tubular, 5-lobed; lobes white or pale pink, tinged with pink or wine-red. Filaments 3–5 mm long, filiform; anthers c. 1 mm long, oblong, reddish-brown or blue. Ovary bluntly trigonous; styles of the long-styled flowers 2.5–5.5 mm long; styles of the short-styled flowers 1–1.5(2) mm long, united for two-thirds of their length.
    Stamens
    Filaments 3–5 mm long, filiform; anthers c. 1 mm long, oblong, reddish-brown or blue.
    Pistil
    Ovary bluntly trigonous; styles of the long-styled flowers 2.5–5.5 mm long; styles of the short-styled flowers 1–1.5(2) mm long, united for two-thirds of their length.

    Images

    Distribution

    Native to:

    Cape Provinces, KwaZulu-Natal

    Oxygonum dregeanum Meisn. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Rudatis, H. [1131], South Africa Oxygonum natalense K000244030

    First published in Linnaea 14: 487 (1841)

    Accepted by

    • 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
    • Bothalia 18: 173 (1988).
    • Prodr. Fl. SW. Afrika, fam. 23: 4 (1969).
    • Kew Bull. 12: 166 (1957).
    • Burtt Davy, Fl. Pl. Ferns Transvaal, part 1: 167 (1926).
    • F.C. 5, 1: 461 (1912).
    • Linnaea 14: 487 (1840).
    Kew Backbone Distributions
    • Germishuizen, G. & Meyer, N.L. (eds.) (2003). Plants of Southern Africa an annotated checklist Strelitzia 14: 1-1231. National Botanical Institute, Pretoria.

    Sources

    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.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/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