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This species is accepted, and its native range is Congo to Kenya and N. Zambia.

[FTEA]

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

Habit
A shrub or straggling glabrous climber, up to 3 m. tall or more.
Stem
Stems brown.
Leaves
Leaves astringent, petiolate, often clustered, narrowly to broadly elliptic with a hastate base, a little narrowed above the basal lobes, up to 5 (–9) cm. long, apically acute; lobes reflexed, small, not exceeding 5 × 2 mm.; leaves markedly trinervate (except in very narrow leaves), the lateral nerves arising arcuately from the base of the midrib and remaining complementarily parallel throughout most of their length.
Petiole
Petioles 1–4 cm. long.
Inflorescences
Inflorescence a much-branched, ± slender, leafless panicle.
Flowers
Flowers in fascicles, on filiform pedicels up to 5 mm. long.
Tepal
Outer tepals 1.75–2 mm. long, ovate, obtuse, later reflexing. Inner tepals wing-like, 5–7 mm. in diameter, ± pellucid, subequal, circular when mature, with a squarish basal sinus 1–1.5 mm. deep, red or reddish-brown, reticulately veined and with a small wart-like reflexed protuberance at the base.
Fruits
Nut trigonous, ovoid, 2–2.5 × 1 mm., brown, shining.
Figures
Fig. 2/1 and 2.
Habitat
Open mist-forest, also upland grassland, bushland and exposed rocky slopes, 870–2400 m.; occasionally cultivated for its medical properties.
Distribution
K3 K4 K6 T2 T3 T4 T7 U2 U3 U4

[FZ]

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

Habit
A shrub, or sometimes a straggling climber A shrub, or sometimes a straggling climber.
Stem
Stems up to 3 m or more tall, glabrous, striate Stems up to 3 m or more tall, glabrous, striate.
Leaves
Leaf lamina 3.5–9 × 1.5–3 cm, narrowly to broadly elliptic, apex acute, with a hastate base, narrowed above the basal lobes, markedly 3-nerved; basal lobes 5 × 2 mm, reflexed; petiole 1–4 cm long Leaf lamina 3.5–9 × 1.5–3 cm, narrowly to broadly elliptic, apex acute, with a hastate base, narrowed above the basal lobes, markedly 3-nerved; basal lobes 5 × 2 mm, reflexed; petiole 1–4 cm long.
Ocrea
Ocrea 1–1.5 cm long, membranous, entire, caducous Ocrea 1–1.5 cm long, membranous, entire, caducous.
Ecology
In moist shady places, in high rainfall grassland, also as roadside weeds and in disturbed ground; 800–1900 m.
Note
Pawek (No. 12968) notes this species planted as a hedge at Ekwendeni in northern Malawi.
Distribution
Also in Uganda, Kenya, Tanzania and Dem. Rep. Congo. ZAM N, MAL N Zambia Malawi
Flowers
Flowers polygamous, bracteate, pedicellate, arranged in whorls of 2–6 flowers; pedicels 2–5 mm long, slender, unequal; whorls borne in leafless terminal, cylindrical or ± pyramidal panicles. Flowers polygamous, bracteate, pedicellate, arranged in whorls of 2–6 flowers; pedicels 2–5 mm long, slender, unequal; whorls borne in leafless terminal, cylindrical or ± pyramidal panicles
Perianth
Outer perianth segments brownish, 1.75–2 mm long, ovate, obtuse at the apex, membranous, deflexed and accrescent in fruit; inner perianth segments red or reddish-brown, pellucid, 5–7 mm in diameter, ± circular and wing-like when mature, rounded at the apex, cordate at the base with a squarish basal sinus, reticulately veined, with a small wart-like deflexed dorsal protuberance near the base. Outer perianth segments brownish, 1.75–2 mm long, ovate, obtuse at the apex, membranous, deflexed and accrescent in fruit; inner perianth segments red or reddish-brown, pellucid, 5–7 mm in diameter, ± circular and wing-like when mature, rounded at the apex, cordate at the base with a squarish basal sinus, reticulately veined, with a small wart-like deflexed dorsal protuberance near the base
Stamens
Stamens 6; filaments as long as the perianth segments, filiform; anthers 1.5 × 0.5 mm, cylindrical. Stamens 6; filaments as long as the perianth segments, filiform; anthers 1.5 × 0.5 mm, cylindrical
Ovary
Ovary 1.5 × 1 mm, trigonous. Ovary 1.5 × 1 mm, trigonous
Fruits
Nut brown, shiny, 2–2.5 mm long, trigonous. Nut brown, shiny, 2–2.5 mm long, trigonous.

Native to:

Burundi, Congo, Kenya, Malawi, Rwanda, Tanzania, Uganda, Zambia, Zaïre

Rumex usambarensis (Engl.) Dammer appears in other Kew resources:

Date Reference Identified As Barcode Type Status
May 17, 1956 Holst, C. [2429], Tanzania K000244108 lectotype
May 17, 1956 Michelmore, A. [711], Tanzania K000244109 holotype

First published in Bot. Jahrb. Syst. 38: 61 (1905)

Accepted by

  • Masharabu, T., Bigendako, M.J., Lejoly, J., Nkengurutse, J., Noret, N., Bizuru, E. & Bogaert, J. (2010). Etude analytique de la flore et de la végétation du Parc National de la Ruvubu, Burundi International Journal of Biological and Chemical Sciences 4: 834-856.
  • Pope, G.V., Polhill, R.M. & Martins, E.S. (eds.) (2006). Flora Zambesiaca 9(3): 1-277. Royal Botanic Gardens, Kew.
  • Troupin, G. (ed.) (1978). Flora du Rwanda 1: 1-413. Musee Royal de l'Afrique Centrale.
  • Graham, R.A. (1958). Flora of Tropical East Africa, Polygonaceae: 1-40.

Literature

Flora Zambesiaca

  • F.T.E.A., Polygonaceae: 7, fig. 2/1, 2 (1958).
  • Kew Bull. 11: 254 (1956)
  • Bot. Jahrb. Syst. 38: 61 (1905).

Kew Backbone Distributions

  • Masharabu, T., Bigendako, M.J., Lejoly, J., Nkengurutse, J., Noret, N., Bizuru, E. & Bogaert, J. (2010). Etude analytique de la flore et de la végétation du Parc National de la Ruvubu, Burundi International Journal of Biological and Chemical Sciences 4: 834-856.
  • Pope, G.V., Polhill, R.M. & Martins, E.S. (eds.) (2006). Flora Zambesiaca 9(3): 1-277. Royal Botanic Gardens, Kew.
  • Sita, P. & Moutsambote, J.-M. (2005). Catalogue des plantes vasculaires du Congo, ed. sept. 2005: 1-158. ORSTOM, Centre de Brazzaville.
  • Troupin, G. (ed.) (1978). Flora du Rwanda 1: 1-413. Musee Royal de l'Afrique Centrale.

Flora of Tropical East Africa

  • R. A. Graham in Kew Bulletin 1956: 254 (1956).
  • Dammer in A. Engler, Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 38: 61 (1905).

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.
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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