1. Family: Polygonaceae Juss.
    1. Genus: Oxygonum Burch. ex Campd.
      1. Oxygonum salicifolium Dammer

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

    [FTEA]

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

    Habit
    A creeping herb, with ascending or prostrate branches.
    Stem
    Creeping stems woody, reddish-brown, subglabrous to pilose; shoots up to 35 cm. long, pubescent.
    Ocrea
    Ocreae 0.4–1 cm. long, membranous, thinly or thickly covered with whitish hairs, terminally truncate and fringed with red setae 6–9 mm. long, the leaf inserted usually in the centre or slightly below.
    Leaves
    Leaves sessile, narrowly linear-lanceolate, broadest towards the base, (30–) 50–60 (–70) × (2) 38 (–10) mm., not or only slightly sinuous on the margin, apically acute, often mucronate, basally narrowed, the midrib prominent below, whitish, almost glabrous on both faces, or pilose mainly on the margins and midrib.
    Inflorescences
    Inflorescence slender, 12–20 cm. long.
    Bracts
    Bracts 3–3.5 mm. long, glandular, usually glabrous, truncate but produced dorsally to an acute setose apex, with a terminal fringe of 3–5 setae which may exceed the length of the bract.
    Tepal
    Tepals 4 mm. long (6 mm. fide Dammer); linear-lanceolate, the tube very short.
    Filaments
    Filaments 3.5–4 mm..
    Style
    Short-styled flowers with styles 1 mm. long, free almost to the base; long-styled flowers with styles ± 4 mm. long, exserted.
    Fruits
    Fruit pubescent, 10 mm. long, with three prickles 3–3.5 mm. long, spreading horizontally (or slightly ascending) from the centre or from up to 1 mm. above it.
    Figures
    Fig. 5/5 and 6, p. 29.
    Habitat
    Grasslands and disturbed ground; 0–1560 m.
    Distribution
    K4 K7 T1 T3 T5 T7 not known elsewhere
    [FZ]

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

    Type
    Type from Tanzania.
    Habit
    A creeping perennial plant with ascending or prostrate branches A creeping perennial plant with ascending or prostrate branches.
    Stem
    Stems reddish-brown, woody, pubescent or subglabrous; shoots up to 35 cm long, pubescent Stems reddish-brown, woody, pubescent or subglabrous; shoots up to 35 cm long, pubescent.
    Leaves
    Leaves sessile, (30)50–60(70) × (2)3–8(10) mm, elliptic to linear-lanceolate, acute at the apex, often mucronate, narrowed and cuneate towards the base, the midrib prominent below, not or slightly sinuous on the margin, whitish and almost glabrous on both surfaces, or ± pubescent on the margins and midrib Leaves sessile, (30)50–60(70) × (2)3–8(10) mm, elliptic to linear-lanceolate, acute at the apex, often mucronate, narrowed and cuneate towards the base, the midrib prominent below, not or slightly sinuous on the margin, whitish and almost glabrous on both surfaces, or ± pubescent on the margins and midrib.
    Ocrea
    Ocrea 0.4–1 cm long, truncate and fringed with red setae 6–9 mm long at the apex, thinly or thickly covered with whitish hairs Ocrea 0.4–1 cm long, truncate and fringed with red setae 6–9 mm long at the apex, thinly or thickly covered with whitish hairs.
    Flowers
    Hermaphrodite flowers heterostylous; perianth tubular, 4–5-lobed, tube c. 2 mm long, lobes 2–2.5 mm long and oblong-lanceolate to linear-lanceolate, pubescent outside, glabrous inside Flowers pedicellate, 1–3 in the axils of chartaceous bracts arranged in terminal slender spiciform racemes 12–20 cm long; bracts 3–4 mm long, ± pubescent, truncate but produced dorsally into an acute setose apex, with a terminal fringe of 3–5 setae which may exceed the bract in length; bracteoles 2, hyaline, c. 2 mm long with 1–2 short setae at the apex; pedicels up to 4 mm long. Male flowers not seen Flowers pedicellate, 1–3 in the axils of chartaceous bracts arranged in terminal slender spiciform racemes 12–20 cm long; bracts 3–4 mm long, ± pubescent, truncate but produced dorsally into an acute setose apex, with a terminal fringe of 3–5 setae which may exceed the bract in length; bracteoles 2, hyaline, c. 2 mm long with 1–2 short setae at the apex; pedicels up to 4 mm long Hermaphrodite flowers heterostylous; perianth tubular, 4–5-lobed, tube c. 2 mm long, lobes 2–2.5 mm long and oblong-lanceolate to linear-lanceolate, pubescent outside, glabrous inside. Male flowers not seen.
    Filaments
    Filaments 2.5(4) mm long, filiform; anthers 0.5–0.55 × 0.35–0.4 mm, oblong
    Ovary
    Ovary 2–2.5 mm long, ellipsoid; styles of long-styled flowers c. 4 mm long; styles of short-styled flowers shorter than the stamens, c. 1.5 mm long
    Ecology
    Grasslands and disturbed ground; c. 950 m.
    Distribution
    ZAM S Zambia Also in Kenya, Tanzania and Angola.
    Male
    Male flowers not seen.
    Stamens
    Filaments 2.5(4) mm long, filiform; anthers 0.5–0.55 × 0.35–0.4 mm, oblong.
    Pistil
    Ovary 2–2.5 mm long, ellipsoid; styles of long-styled flowers c. 4 mm long; styles of short-styled flowers shorter than the stamens, c. 1.5 mm long.
    Hermaphrodite
    Ovary 2–2.5 mm long, ellipsoid; styles of long-styled flowers c. 4 mm long; styles of short-styled flowers shorter than the stamens, c. 1.5 mm long. Filaments 2.5(4) mm long, filiform; anthers 0.5–0.55 × 0.35–0.4 mm, oblong. Hermaphrodite flowers heterostylous; perianth tubular, 4–5-lobed, tube c. 2 mm long, lobes 2–2.5 mm long and oblong-lanceolate to linear-lanceolate, pubescent outside, glabrous inside.
    Fruits
    Nut c. 10 mm long, with 3 prickles 3–3.5 mm long, spreading horizontally or somewhat ascending from the middle, or from up to 1 mm above the middle. Nut c. 10 mm long, with 3 prickles 3–3.5 mm long, spreading horizontally or somewhat ascending from the middle, or from up to 1 mm above the middle.

    Distribution

    Native to:

    Angola, Kenya, Tanzania, Zambia

    Oxygonum salicifolium Dammer appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Jul 1, 1893 Holst, C. [3186], Tanzania K000244057 lectotype

    First published in Abh. Königl. Akad. Wiss. Berlin 1894: 41 (1894)

    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.
    • Graham, R.A. (1958). Flora of Tropical East Africa, Polygonaceae: 1-40.

    Literature

    Flora Zambesiaca
    • F.T.E.A., Polygonaceae: 31 (1958).
    • Kew Bull. 12: 163 (1957)
    • F.T.A. 6, 1: 102 (1909).
    • Engler, Pflanzenw. Ost-Afrikas C: 171 (1895).
    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.
    Flora of Tropical East Africa
    • Baker & C.H. Wright in Flora of Tropical Africa 6 (1): 102 (1909).
    • Dammer in Die Pflanzenwelt Ost-Afrikas und der Nachbargebiete, Theile C: 171 (1895).

    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