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

[FZ]

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

Type
Type:Zambia, Solwezi, 20.ix.1930, Milne-Redhead 1162 (K, holotype).
Habit
An erect or ± decumbent perennial herb with many stems from a thick woody rootstock An erect or ± decumbent perennial herb with many stems from a thick woody rootstock.
Stem
Stems annual, reddish-brown, 8–35 cm long, longitudinally striate, leafless at the base, ± pubescent Stems annual, reddish-brown, 8–35 cm long, longitudinally striate, leafless at the base, ± pubescent.
Flowers
Hermaphrodite flowers heterostylous; perianth white with lobes tinged pink outside; tube 1.5–2 mm long, puberulous outside; lobes 4–7 × 3 mm long, ovate-elliptic to oblong-elliptic. Filaments 2–5 mm long; anthers 0.9–1 × 0.35–0.4 mm Flowers pedicellate, 2–6 in the axils of bracts, arranged in terminal and lateral spiciform racemes up to 17 cm long, pedicels 5–8 mm long, accrescent up to 12 mm and reflexed in fruit; bracts chartaceous, obliquely truncate and produced dorsally into an acute subulate seta, sometimes with a fringe of short setae. Male flowers not seen Flowers pedicellate, 2–6 in the axils of bracts, arranged in terminal and lateral spiciform racemes up to 17 cm long, pedicels 5–8 mm long, accrescent up to 12 mm and reflexed in fruit; bracts chartaceous, obliquely truncate and produced dorsally into an acute subulate seta, sometimes with a fringe of short setae Hermaphrodite flowers heterostylous; perianth white with lobes tinged pink outside; tube 1.5–2 mm long, puberulous outside; lobes 4–7 × 3 mm long, ovate-elliptic to oblong-elliptic. Male flowers not seen.
Ovary
Ovary 0.5–1 mm long; style connate in the lower c. 2 mm, 3-branched; style of long-styled flowers 4–6.5 mm long; style of short-styled flowers (1)1.5–2.5(3) mm
Fruits
Nut reddish-brown when mature, 7–9 × 4–5 mm, ovoid-trigonous, longitudinally striate, unwrinkled or very irregularly wrinkled, puberulous. Nut reddish-brown when mature, 7–9 × 4–5 mm, ovoid-trigonous, longitudinally striate, unwrinkled or very irregularly wrinkled, puberulous.
Ecology
Miombo and Cryptosepalum woodland, roadsides, recently burnt ground; 1350–1600 m.
Note
Following the study of material from the Flora Zambesiaca area and other countries, we conclude that O. vanderystii Robyns is conspecific with O. pachybasis. Putative differences related to stem length and consistency (Robyns 1944, 1948) and morphology of fruits (Graham 1957) are, in our opinion, questionable: stem length and texture are highly variable and fruits are always trigonous, including those of the type of O. pachybasis.
Distribution
ZAM N, ZAM W Also in SW Tanzania, Dem. Rep. Congo and Angola. Zambia
Leaves
Leaves 3.5–6 × 0.9–1.3 cm, elliptic-lanceolate to lanceolate, acute apiculate at the apex, attenuate at the base, entire on the margins, pubescent to glabrescent, midrib prominent beneath. Leaves 3.5–6 × 0.9–1.3 cm, elliptic.lanceolate to lanceolate, acute apiculate at the apex, attenuate at the base, entire on the margins, pubescent to glabrescent, midrib prominent beneath
Ocrea
Ocrea reddish-brown, 0.8–1.3 cm long, truncate with a fringe of brownish setae 3–7 mm long at the apex, ± pubescent. Ocrea reddish-brown, 0.8–1.3 cm long, truncate with a fringe of brownish setae 3–7 mm long at the apex, ± pubescent
Male
Male flowers not seen.
Stamens
Filaments 2–5 mm long; anthers 0.9–1 × 0.35–0.4 mm.
Hermaphrodite
Filaments 2–5 mm long; anthers 0.9–1 × 0.35–0.4 mm. Ovary 0.5–1 mm long; style connate in the lower c. 2 mm, 3-branched; style of long-styled flowers 4–6.5 mm long; style of short-styled flowers (1)1.5–2.5(3) mm. Hermaphrodite flowers heterostylous; perianth white with lobes tinged pink outside; tube 1.5–2 mm long, puberulous outside; lobes 4–7 × 3 mm long, ovate-elliptic to oblong-elliptic.
Pistil
Ovary 0.5–1 mm long; style connate in the lower c. 2 mm, 3-branched; style of long-styled flowers 4–6.5 mm long; style of short-styled flowers (1)1.5–2.5(3) mm.

Native to:

Angola, Tanzania, Zambia, Zaïre

Oxygonum pachybasis Milne-Redh. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Milne - Redhead, E. [1162], Zambia K000244019 holotype

First published in Hooker's Icon. Pl. 33: t. 3215 (1933)

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.
  • Robyns, W. & al. (eds.) (1948-1963). Flore du Congo Belge et du Ruanda-Urundi 1-10.

Literature

Flora Zambesiaca

  • Kew Bull. 12: 169 (1957).
  • F.C.B. 1: 405 (1948).
  • Bull. Jard. Bot. État 17: 163 (1944)
  • Hooker’s Icon. Pl. 33: t. 3215 (1933).

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.
  • Robyns, W. & al. (eds.) (1948-1963). Flore du Congo Belge et du Ruanda-Urundi 1-10.

Flora Zambesiaca
Flora Zambesiaca
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Herbarium Catalogue Specimens
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Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. 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 2021. 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