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

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

    [FZ]

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

    Type
    Type from Tanzania.
    Habit
    Perennial herb, with several stems from a woody rootstock Perennial herb, with several stems from a woody rootstock.
    Stem
    Stems red-brown, trailing or ascending, 40–50 cm long, longitudinally striate, puberulous Stems red-brown, trailing or ascending, 40–50 cm long, longitudinally striate, puberulous.
    Leaves
    Leaves 1.5–5 × 0.6–1.2 cm, lanceolate or elliptic.lanceolate to ± deltate, apex acute, base narrowed into a petiole up to 1 cm long, margin usually ± shallowly lobed, sometimes entire, midrib prominent beneath, lamina sparsely puberulous on both surfaces Leaves 1.5–5 × 0.6–1.2 cm, lanceolate or elliptic-lanceolate to ± deltate, apex acute, base narrowed into a petiole up to 1 cm long, margin usually ± shallowly lobed, sometimes entire, midrib prominent beneath, lamina sparsely puberulous on both surfaces.
    Ocrea
    Ocrea 5–8 mm long, membranous, truncate with a terminal fringe of reddish wavy setae c. 5 mm long Ocrea 5–8 mm long, membranous, truncate with a terminal fringe of reddish wavy setae c. 5 mm long.
    Flowers
    Hermaphrodite flowers strongly heterostylous; perianth 5-lobed; tube 1.5 mm long, pubescent outside; lobes 2–2.5(5) mm long, oblong Male flowers not seen Flowers pedicellate, 1–4 in the axil of bracts, arranged in an elongated spiciform raceme up to c. 35 cm long; raceme erect or slightly arcuate; bracts 2.5–4 mm long, puberulous to glabrous, truncate, fringed at the apex with 3–5 setae c. 2 mm long; pedicels 4–6 mm long; bracteoles 2.5–4 mm long Flowers pedicellate, 1–4 in the axil of bracts, arranged in an elongated spiciform raceme up to c. 35 cm long; raceme erect or slightly arcuate; bracts 2.5–4 mm long, puberulous to glabrous, truncate, fringed at the apex with 3–5 setae c. 2 mm long; pedicels 4–6 mm long; bracteoles 2.5–4 mm long. Hermaphrodite flowers strongly heterostylous; perianth 5-lobed; tube 1.5 mm long, pubescent outside; lobes 2–2.5(5) mm long, oblong. Male flowers not seen.
    Filaments
    Filaments 2–3 mm long; anthers 0.3–0.4 × 0.2–0.3 mm, ellipsoid
    Ovary
    Ovary 3–3.5 mm long, fusiform; styles of long-styled flowers 3–3.5 mm long, free almost to the base, strongly exserted; styles of short-styled flowers c. 1 mm long
    Ecology
    On disturbed soils, sandy soils on roadsides, in miombo woodland; 775–2100 m.
    Note
    This species shows considerable variation in leaf shape and in the hairiness of the leaves. Oxygonum baumii, the type of which is the only record for Angola, was included here with doubt by Graham, loc. cit. (1957).
    Distribution
    MAL N Malawi Also in Dem. Rep. Congo (Kivu), Kenya, Tanzania and Angola.
    Male
    Male flowers not seen.
    Stamens
    Filaments 2–3 mm long; anthers 0.3–0.4 × 0.2–0.3 mm, ellipsoid.
    Hermaphrodite
    Filaments 2–3 mm long; anthers 0.3–0.4 × 0.2–0.3 mm, ellipsoid. Ovary 3–3.5 mm long, fusiform; styles of long-styled flowers 3–3.5 mm long, free almost to the base, strongly exserted; styles of short-styled flowers c. 1 mm long. Hermaphrodite flowers strongly heterostylous; perianth 5-lobed; tube 1.5 mm long, pubescent outside; lobes 2–2.5(5) mm long, oblong.
    Pistil
    Ovary 3–3.5 mm long, fusiform; styles of long-styled flowers 3–3.5 mm long, free almost to the base, strongly exserted; styles of short-styled flowers c. 1 mm long.
    Fruits
    Nut c. 5 mm long, fusiform, trigonous, papillose, with 3 spreading prickles on the angles a little below the middle, 3–5 mm long. Nut c. 5 mm long, fusiform, trigonous, papillose, with 3 spreading prickles on the angles a little below the middle, 3–5 mm long.
    [FTEA]

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

    Habit
    ? Perennial herb, probably with a trailing woody base, and with ascending, reddish, puberulous stems.
    Ocrea
    Ocreae 5–8 mm. long, membranous, puberulous, truncate with a terminal fringe of rather wavy setae ± 5 mm. long.
    Leaves
    Leaves petiolate, up to 5 × 1.2 cm., lanceolate, elliptic-lanceolate, or subdeltoid, the margins ± entire or more usually shallowly sinuous, very acute long narrowed to the base, glabrous, pustular on the undersurface.
    Petiole
    Petioles rather long, up to 1 cm. in length.
    Inflorescences
    Inflorescence elongated, rather stout, up to ± 35 cm. long, straight or slightly arcuate.
    Bracts
    Bracts 2.5–4 mm. long, puberulous to glabrous, fringed with 3–5 setae ± 2 mm. long.
    Pedicel
    Pedicels somewhat exceeding the bracts.
    Flowers
    Flowers strongly heterostylous. Long styles 3–3.5 mm. long, free almost to the base, strongly exserted. Short styles 1 mm. long or slightly less. Tepals ovate-elliptic, 2 mm. long (5 mm. in long-styled flowers, fide Dammer).
    Fruits
    Fruit 5 mm. long, fusiform, thinly papillose, with 3 spreading prickles a little below the middle.
    Habitat
    Cultivated or disturbed ground; from 2100 m. probably nearly to sea level
    Distribution
    K3 T1 T2 T3 T4 also probably in Nyasaland and Rhodesia

    Images

    Distribution

    Native to:

    Angola, Burundi, Kenya, Malawi, Tanzania, Zaïre

    Oxygonum stuhlmannii Dammer appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Apr 6, 1956 Baum, H. [532], Angola K000244065 Unknown type material
    Bidgood, S. [6424], Tanzania K000468001
    Bidgood, S. [6249], Tanzania K000468176
    Bidgood, S. [6017], Tanzania K000468408
    Bidgood, S. [5979], Tanzania K000468446
    Scott Elliot, G.F. [8322], Tanzania Oxygonum fasciculatum K000244054
    unknown [6651], Tanzania Oxygonum fasciculatum K000244055 lectotype
    unknown [6265], Tanzania Oxygonum fasciculatum K000244056

    First published in H.G.A.Engler, Pflanzenw. Ost-Afrikas, C: 171 (1895)

    Accepted by

    • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
    • Lewalle, J. (1970). Liste floristique et répartition altitudinale de la flore du Burundi occidental: 1-84. Université officielle de Bujumbura.
    • Graham, R.A. (1958). Flora of Tropical East Africa, Polygonaceae: 1-40.

    Literature

    Flora Zambesiaca
    • F.T.E.A., Polygonaceae: 38 (1958).
    • Kew Bull. 12: 161 (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.
    • Lewalle, J. (1970). Liste floristique et répartition altitudinale de la flore du Burundi occidental: 1-84. Université officielle de Bujumbura.
    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.
    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