1. Family: Polygonaceae Juss.
    1. Genus: Oxygonum Burch. ex Campd.
      1. Oxygonum atriplicifolium (Meisn.) Martelli

        This species is accepted, and its native range is NE. Tropical Africa to NE. Kenya, Mozambique, Madagascar.

    [FTEA]

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

    Habit
    A slender, much branched, straggling and trailing herb.
    Stem
    Stems weak, pubescent mainly down one side, up to 1 m. long or more.
    Ocrea
    Ocreae up to 1 cm. long, light brown, membranous, pubescent, not closely appressed, truncate with a terminal fringe of setae which may exceed the length of the tube; the leaf inserted in the upper half.
    Leaves
    Leaves small, petiolate, commonly 2–3 × 1.5–1.8 cm., deltoid, deltoid-ovate, or deltoid-lanceolate, marginally entire or slightly uneven, but not deeply lobed, apically very acute, the apex sometimes aristate, basally truncate to cuneate (rarely sagittate), sometimes ± hastate, glabrous above, the margin and veins of the undersurface pubescent, the lamina often pustular below.
    Petiole
    Petioles pubescent, 1–1.5 cm. long.
    Inflorescences
    Inflorescence slender, leafless, up to 30 cm. or more long, the stalk less than 1 mm. thick.
    Bracts
    Bracts up to 25 mm. apart below, 3–4 mm. long, pubescent and fringed as the ocreae.
    Pedicel
    Pedicels filiform, pubescent; those of hermaphrodite flowers lengthening, exceeding the bracts by 4–6 mm., becoming patent and later reflexing; those of male flowers neither lengthening nor reflexing but withering, not exceeding the bracts by more than ± 3 mm.
    Flowers
    Flowers white or greenish outside, strongly heterostylous; long-styled flowers with broadly linear or ovate tepals, 1.5 mm. long; styles 2 mm., connate 0.75 mm. (short-styled flowers not seen) (male flowers with 5 narrow, oblong, obtuse, flat tepals; hermaphrodite flowers with 6 tepals, the inner 3 petaloid, the outer 3 keeled, fide Meisner).
    Fruits
    Fruit fusiform, 5–6.5 mm. long, 1 (–2) to each bract, pendulous, glabrous or pubescent (sometimes on the same plant), bearing 3 spreading prickles ± 1 mm. long at the centre or slightly below.
    Figures
    Fig. 5/3 and 4, p. 29.
    Habitat
    Hedgerows, cultivated and waste ground; altitude range uncertain, but descending to sea level
    Distribution
    K7
    [FZ]

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

    Type
    Lectotype, chosen by Graham (1957), a cultivated plant from Calcutta Botanic Garden (probably from E Africa), Herb. Wallich 1719 (K, lectotype).
    Flowers
    Male flowers 5-lobed; lobes narrowly oblong, obtuse at the apex Flowers pedicellate, 1–3 in the axil of each bract, arranged in leafless spiciform terminal or axillary racemes up to 30 cm long or more; bracts up to 25 mm apart, 3–4 mm long, obliquely truncate, acute or acuminate with a fringe of setae at the apex; pedicels filiform, pubescent, those of hermaphrodite flowers lengthening to exceed the bracts by 4–6 mm, becoming patent and later reflexed; pedicels of male flowers not exceeding the bracts by more than c. 3 mm, withering, not lengthening or reflexed. Hermaphrodite flowers strongly heterostylous; perianths white or greenish outside, 5–6-lobed; lobes 1.5 mm long and broadly linear or ovate Flowers pedicellate, 1–3 in the axil of each bract, arranged in leafless spiciform terminal or axillary racemes up to 30 cm long or more; bracts up to 25 mm apart, 3–4 mm long, obliquely truncate, acute or acuminate with a fringe of setae at the apex; pedicels filiform, pubescent, those of hermaphrodite flowers lengthening to exceed the bracts by 4–6 mm, becoming patent and later reflexed; pedicels of male flowers not exceeding the bracts by more than c. 3 mm, withering, not lengthening or reflexed Male flowers 5-lobed; lobes narrowly oblong, obtuse at the apex. Hermaphrodite flowers strongly heterostylous; perianths white or greenish outside, 5–6-lobed; lobes 1.5 mm long and broadly linear or ovate.
    Style
    Styles of long-styled flowers 2 mm long and connate below for 0.75 mm; short-styled flowers not seen Styles of long-styled flowers 2 mm long and connate below for 0.75 mm; short-styled flowers not seen.
    Fruits
    Nut pendulous, 5–6.5(7) mm long, fusiform, trigonous, glabrous or pubescent, with 3 spreading prickles c. 1 mm long arising on the angles at or slightly below the middle. Nut pendulous, 5–6.5(7) mm long, fusiform, trigonous, glabrous or pubescent, with 3 spreading prickles c. 1 mm long arising on the angles at or slightly below the middle.
    Ecology
    Disturbed places, sandy soils.
    Note
    Forbes is not known to have collected plants from East Africa, but O. atriplicifolium is common around Mombasa and Malindi, and was collected there from the middle of the nineteenth century onwards, so this record from c. 1800, assumed to be from Mozambique according to a note by N.E. Brown on the herbarium sheet, may be incorrect.
    Distribution
    Also in Somalia, Madagascar and Kenya. Mozambique Without precise locality (“E coast of Africa”), Forbes s.n. (K).
    Habit
    A slender straggling or trailing annual or short-lived perennial herb. A slender straggling or trailing annual or short-lived perennial herb
    Stem
    Stems herbaceous, weak, reddish, up to 1 m long, much branched, longitudinally striate, glabrous to pubescent. Stems herbaceous, weak, reddish, up to 1 m long, much branched, longitudinally striate, glabrous to pubescent
    Leaves
    Leaves petiolate; lamina 2–3 × 1.5–1.8 cm, deltate to deltate-ovate or deltate-lanceolate, with the margins entire or slightly uneven but not deeply lobed, acute and sometimes ± aristate at the apex, truncate to cuneate at the base, rarely sagittate, glabrous on upper surface, pubescent on margins and veins of the undersurface, undersurface sometimes pustular; petiole 1–1.5 cm long, pubescent. Leaves petiolate; lamina 2–3 × 1.5–1.8 cm, deltate to deltate-ovate or deltate-lanceolate, with the margins entire or slightly uneven but not deeply lobed, acute and sometimes ± aristate at the apex, truncate to cuneate at the base, rarely sagittate, glabrous on upper surface, pubescent on margins and veins of the undersurface, undersurface sometimes pustular; petiole 1–1.5 cm long, pubescent
    Ocrea
    Ocrea light brown, membranous, up to 1 cm long, pubescent, truncate with a fringe of reddish-brown setae at the apex; setae may exceed ocrea tube in length. Ocrea light brown, membranous, up to 1 cm long, pubescent, truncate with a fringe of reddish-brown setae at the apex; setae may exceed ocrea tube in length
    Male
    Male flowers 5-lobed; lobes narrowly oblong, obtuse at the apex.
    Hermaphrodite
    Hermaphrodite flowers strongly heterostylous; perianths white or greenish outside, 5–6-lobed; lobes 1.5 mm long and broadly linear or ovate. Styles of long-styled flowers 2 mm long and connate below for 0.75 mm; short-styled flowers not seen.

    Images

    Distribution

    Native to:

    Chad, Kenya, Madagascar, Mozambique, Somalia, Sudan

    Oxygonum atriplicifolium (Meisn.) Martelli appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Mar 25, 1957 s.coll. [s.n.] K000830458

    First published in Fl. Bogos.: 69 (1886)

    Accepted by

    • Dobignard, A. & Chatelain, C. (2013). Index synonymique de la flore d'Afrique du nord 5: 1-451. Éditions des conservatoire et jardin botaniques, Genève.
    • Brundu, G. & Camarda, I. (2013). The Flora of Chad: a checklist and brief analysis PhytoKeys 23: 1-18.
    • Pope, G.V., Polhill, R.M. & Martins, E.S. (eds.) (2006). Flora Zambesiaca 9(3): 1-277. Royal Botanic Gardens, Kew.
    • Boulos, L. (1999). Flora of Egypt 1: 1-419. Al Hadara Publishing, Cairo.
    • Bosser, J. & al. (eds.) (1994). Flore des Mascareignes 136-148: 1. IRD Éditions, MSIRI, RBG-Kew, Paris.
    • Thulin, M. (ed.) (1993). Flora of Somalia 1: 1-493. The Royal Botanic Gardens, Kew.
    • Graham, R.A. (1958). Flora of Tropical East Africa, Polygonaceae: 1-40.

    Literature

    Flora Zambesiaca
    • Thulin, Fl. Somalia 1: 178, fig. 95 (1993).
    • F.T.E.A., Polygonaceae: 37 (1958).
    • Kew Bull. 12: 162 (1957)
    • Fl. Madagascar, fam. 65, Polygonacées: 7 (1953).
    • F.T.A. 6, 1: 101 (1909).
    • Martelli, Fl. Bogos.: 69 (1886).
    Kew Backbone Distributions
    • Brundu, G. & Camarda, I. (2013). The Flora of Chad: a checklist and brief analysis PhytoKeys 23: 1-18.
    • Boulos, L. (1999). Flora of Egypt 1: 1-419. Al Hadara Publishing, Cairo.
    • Thulin, M. (ed.) (1993). Flora of Somalia 1: 1-493. The Royal Botanic Gardens, Kew.
    Flora of Tropical East Africa
    • Baker & Wright, Flora of Tropical Africa, 6 (1): 101 (1909).
    • Martel., Fl. Bogos.: 69 (1886).

    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.
    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