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

Morphology General Habit
A creeping herb, with ascending or prostrate branches.
Morphology Stem
Creeping stems woody, reddish-brown, subglabrous to pilose; shoots up to 35 cm. long, pubescent.
Morphology Leaves 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.
Morphology 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.
Morphology Reproductive morphology Inflorescences
Inflorescence slender, 12–20 cm. long.
Morphology Reproductive morphology Inflorescences 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.
Morphology Reproductive morphology Flowers Tepal
Tepals 4 mm. long (6 mm. fide Dammer); linear-lanceolate, the tube very short.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 3.5–4 mm..
Morphology Reproductive morphology Flowers Gynoecium Style
Short-styled flowers with styles 1 mm. long, free almost to the base; long-styled flowers with styles ± 4 mm. long, exserted.
Morphology Reproductive morphology 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.
Morphology General Habit
A creeping perennial plant with ascending or prostrate branches A creeping perennial plant with ascending or prostrate branches.
Morphology 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.
Morphology 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.
Morphology Leaves 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.
Morphology Reproductive morphology 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.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 2.5(4) mm long, filiform; anthers 0.5–0.55 × 0.35–0.4 mm, oblong
Morphology Reproductive morphology Flowers Gynoecium 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.
sex Male
Male flowers not seen.
Morphology Reproductive morphology Flowers Androecium Stamens
Filaments 2.5(4) mm long, filiform; anthers 0.5–0.55 × 0.35–0.4 mm, oblong.
Morphology Reproductive morphology Flowers Gynoecium 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.
sex 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.
Morphology Reproductive morphology 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.

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.
  • Graham, R.A. (1958). Flora of Tropical East Africa, Polygonaceae: 1-40.
  • Pope, G.V., Polhill, R.M. & Martins, E.S. (eds.) (2006). Flora Zambesiaca 9(3): 1-277. Royal Botanic Gardens, Kew.

Literature

Flora Zambesiaca

  • Engler, Pflanzenw. Ost-Afrikas C: 171 (1895).
  • F.T.A. 6, 1: 102 (1909).
  • F.T.E.A., Polygonaceae: 31 (1958).
  • Kew Bull. 12: 163 (1957)

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).

  • 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

  • Kew Backbone Distributions

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. 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 2022. 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