Oxygonum buchananii (Dammer) J.B.Gillett

This species is accepted, and its native range is SW. Tanzania to S. Tropical Africa.

[FZ]

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

Type
Lectotype, selected by Graham (1957): Malawi, Buchanan 550 (K, lectotype).
Morphology General Habit
A robust perennial herb, sometimes bushy, with a rootstock A robust perennial herb, sometimes bushy, with a rootstock.
Morphology Stem
Stems several from the rootstock, up to 1 m long, prostrate or spreading, longitudinally striate, glabrous or sparsely papillate Stems several from the rootstock, up to 1 m long, prostrate or spreading, longitudinally striate, glabrous or sparsely papillate.
Morphology Leaves
Leaves petiolate, dark green above, paler beneath; lamina 7.5–10 × 4.5–6 cm, obovate to broadly ovate, obtuse or shortly acuminate at the apex, attenuate at the base and decurrent on the petiole, with the midrib prominent beneath, entire or slightly wavy on the margin, glabrous on both surfaces, gland-dotted beneath; petiole 1–2 cm long Leaves petiolate, dark green above, paler beneath; lamina 7.5–10 × 4.5–6 cm, obovate to broadly ovate, obtuse or shortly acuminate at the apex, attenuate at the base and decurrent on the petiole, with the midrib prominent beneath, entire or slightly wavy on the margin, glabrous on both surfaces, gland-dotted beneath; petiole 1–2 cm long.
Morphology Leaves Ocrea
Ocrea brown, 0.5–2 cm long, glabrous outside, truncate with a terminal fringe of 7–9 setae 1–3 cm long Ocrea brown, 0.5–2 cm long, glabrous outside, truncate with a terminal fringe of 7–9 setae 1–3 cm long.
Morphology Reproductive morphology Flowers
Male flowers not seen Flowers pedicellate, 2–4 in the axils of bracts, arranged in elongated spiciform terminal racemes up to 36 cm long; bracts 4–5 mm long, truncate but produced dorsally into an acute setose apex, with or without a terminal fringe of short setae up to 1 mm long; pedicels red-brown, 6–7 mm long, glabrous Hermaphrodite flowers heterostylous, long-styled flowers not seen; perianth yellowish-green, glabrous, 5-lobed; tube 2–3 mm long; lobes 3–4 mm long, oblong Flowers pedicellate, 2–4 in the axils of bracts, arranged in elongated spiciform terminal racemes up to 36 cm long; bracts 4–5 mm long, truncate but produced dorsally into an acute setose apex, with or without a terminal fringe of short setae up to 1 mm long; pedicels red-brown, 6–7 mm long, glabrous. Male flowers not seen. Hermaphrodite flowers heterostylous, long-styled flowers not seen; perianth yellowish-green, glabrous, 5-lobed; tube 2–3 mm long; lobes 3–4 mm long, oblong.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 0.3–3.5 mm long, filiform and flattened toward the base; anthers orange, 0.5–0.55 × 0.4–0.45 mm, oblong
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary 3.4 × 2.3 mm, oblong; styles c. 1 mm long
Ecology
Clay sandy soils in dry river margins; 250–700 m.
Distribution
Malawi ZAM E, MAL S, MOZ N Zambia Mozambique Also in southern Tanzania and Angola.
Morphology Reproductive morphology Flowers Gynoecium Pistil
Ovary 3.4 × 2.3 mm, oblong; styles c. 1 mm long.
sex Hermaphrodite
Ovary 3.4 × 2.3 mm, oblong; styles c. 1 mm long. Filaments 0.3–3.5 mm long, filiform and flattened toward the base; anthers orange, 0.5–0.55 × 0.4–0.45 mm, oblong. Hermaphrodite flowers heterostylous, long-styled flowers not seen; perianth yellowish-green, glabrous, 5-lobed; tube 2–3 mm long; lobes 3–4 mm long, oblong.
Morphology Reproductive morphology Fruits
Nut 8–10 mm across, trigonous, with a spine on each angle; spines 2–3 mm long, pointing somewhat downwards. Nut 8–10 mm across, trigonous, with a spine on each angle; spines 2–3 mm long, pointing somewhat downwards.
sex Male
Male flowers not seen.
Morphology Reproductive morphology Flowers Androecium Stamens
Filaments 0.3–3.5 mm long, filiform and flattened toward the base; anthers orange, 0.5–0.55 × 0.4–0.45 mm, oblong.

[FTEA]

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

Morphology General Habit
A stout perennial (? a bush).
Morphology Stem
Stems glabrous or with scattered papillae.
Morphology Leaves Ocrea
Ocreae 0.5–2 cm. long, brown, ± glabrous, truncate with a terminal fringe of 7–9 setae 1–1.3 mm. long.
Morphology Leaves
Leaves petiolate, glabrous, large for the genus, 7.5–10.5 × 4.5–5.5 cm., entire or with a slightly wavy edge, broadly obovate to broadly ovate, apically obtuse (or shortly acuminate) to rounded, basally long-narrowed and decurrent to the petiole.
Morphology Leaves Petiole
Petioles 1–2 cm.
Morphology Reproductive morphology Inflorescences
Inflorescence elongated, up to 36 cm. long.
Morphology Reproductive morphology Inflorescences Bracts
Bracts 4–5 mm. long, up to 4 cm. apart, truncate but dorsally produced, with or without a terminal fringe of short setae up to 1 mm. long.
Morphology Reproductive morphology Flowers Pedicel
Pedicels glabrous, red, exceeding the bracts by 2.5–3 mm.
Morphology Reproductive morphology Flowers
Flowers 2 (?–4) together.
Morphology Reproductive morphology Flowers Tepal
Tepals 3–4 mm. long, oblong.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens almost equalling the tips of the tepals; anthers orange.
Morphology Reproductive morphology Flowers Gynoecium Style
Styles not seen.
Morphology Reproductive morphology Fruits
Very immature fruit with three protuberances on the angles, these probably being rudimentary prickles.
Figures
Fig. 5/1 and 2.
Habitat
No information available; about 1200 m.
Distribution
T7

Native to:

Angola, Malawi, Tanzania, Zambia, Zimbabwe

Oxygonum buchananii (Dammer) J.B.Gillett appears in other Kew resources:

Date Reference Identified As Barcode Type Status Has image?
May 10, 1956 Buchanan, J [550], Malawi K000244062 lectotype No

First published in Kew Bull. 8: 83 (1953)

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

  • F.T.E.A., Polygonaceae: 28 (1958).
  • Kew Bull. 12: 152 (1957)
  • Kew Bull. 8: 83 (1953).

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

  • Gillett in Kew Bulletin 1953: 83 (1953).

  • 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