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This species is accepted, and its native range is Zimbabwe to S. Africa.
A specimen from Kew's Herbarium

[FZ]

Flora Zambesiaca Acanthaceae (part 2) by Iain Darbyshire, Kaj Vollesen and Ensermu Kelbessa

Morphology General Habit
Perennial herb with much-branched prostrate stems 15–50 cm long from a woody base; stems with short white retrorse hairs often in two opposite rows, and few to numerous ± spreading yellowish hispid hairs.
Morphology Leaves
Leaves often clustered on short lateral branches, narrowly oblong, (ovate-)elliptic or lanceolate, 0.8–3 × 0.3–0.7(1) cm, base cuneate, margin thickened and pale, apex acute, mucronate, yellowish-hispid on margin and midrib beneath, hairs along margin with ± bulbous base forming minute serrations; lateral veins indistinct, midrib prominent beneath; petiole 0–4 mm long.
Morphology Reproductive morphology Inflorescences
Inflorescence a dense cylindrical or subglobose unilateral cymes 2–7.5 cm long in the upper axils, 4–10+-flowered; axis sometimes inrolled at fruiting; bracteoles imbricate, largely enclosing calyx, green, sometimes with white margin, ± broadly ovate, (15)20–32 × (7)10–20 mm, margin entire or minutely toothed due to swollen hair bases, apex spinulose, surface tripli- or palmately nerved, hispid along main veins and margin; paired reduced sterile bracteoles sometimes present at lower nodes.
Morphology Reproductive morphology Flowers Calyx
Calyx green or mauve-tinged, later scarious, accrescent; anterior lobe suborbicular or somewhat ovate or elliptic, 15–21 × 10–17 mm in flower, up to 25 × 28 mm in fruit, base rounded or subcordate, margin entire or with minute teeth formed by swollen hair bases, apex obtuse, rounded or subattenuate and mucronulate, rarely bi-mucronulate, surface yellowish-hairy with softer hairs than leaves, dense along margin; posterior lobe as anterior but broadly ovate(-orbicular), 17–26 × 11–18 mm in flower, to 33 × 29 mm in fruit, apex attenuate to obtuse, spinulose; lateral lobes lanceolate, 7–9 mm long in flower, to 11.5 mm in fruit.
Morphology Reproductive morphology Flowers Corolla
Corolla 31–42 mm long, pale blue to purple with whitish tube, rarely white throughout, glandular-pilose externally; tube cylindrical, 18–28 mm long, somewhat expanded towards mouth; limb subregular; lobes 9–15 mm long, abaxial and lateral lobes 5–9.5 mm wide, adaxial lobes 4–7.5 mm wide.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens attached 12.5–18 mm from base of corolla tube; filaments 8–12.5 mm long; anthers held at mouth or shortly exserted, 2–2.8 mm long; lateral staminodes 1–3 mm long, pubescent at base, antherodes 0.3–1.3 mm long or absent.
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary with apical ring of minute crisped hairs extending onto style base; stigma broadly capitate, 0.6–1.2 mm wide.
Morphology Reproductive morphology Fruits
Capsule 14.5–17 mm long, glabrous.
Morphology Reproductive morphology Seeds
Seeds 5–5.5 × 5.5–6 mm.
Distribution
Also in Namibia and South Africa (Northern Cape, Free State, North West, Gauteng, Limpopo, Mpumalanga).
Ecology
Bare ground, grassland, open wooded grassland on sandy soils, often in disturbed areas such as roadsides, pathways and fallow land; 900–1250 m.
Conservation
Conservation notes: Widespread and fairly common; Least Concern.

[KBu]

Darbyshire, I., Tripp, E.A. & Chase, F.M. (2019). A taxonomic revision of Acanthaceae tribe Barlerieae in Angola and Namibia. Part 1. Kew Bulletin 74: 5. https://doi.org/10.1007/s12225-018-9791-0

Conservation
This is a widespread species with an EOO in excess of 1 million km2. It is fairly common over much of its range, and tolerant of or even favouring moderate habitat disturbance. It is assessed as of Least Concern — LC.
Distribution
Northern Namibia (Kavango West, Khomas, Omaheke and Otjozondjupa Regions); Botswana, Zimbabwe, South Africa (Free State, Gauteng, Limpopo, Mpumalanga Northern Cape and North-West Provinces).
Ecology
Barleria macrostegia occurs in open to more dense dry bushland typically with Acacia spp., grassland, bare earth particularly on compacted soils and pans, and sometimes in disturbed areas such as roadsides; 1150 – 1800 m elevation. It is recorded from the North-eastern Kalahari Woodland, Northern Kalahari, Central Kalahari and Thornbush Shrubland vegetation types of Mendelsohn et al. (2002).
Morphology General Habit
Perennial herb with much-branched prostrate stems 15 – 50 cm long from a woody base and rootstock; stems with short white retrorse hairs often in two opposite rows, and with few to numerous ± spreading yellowish hispid hairs
Morphology Leaves
Leaves often clustered on short lateral branches, narrowly oblong, (ovate-) elliptic or lanceolate, 0.8 – 3.5 × 0.3 – 0.7 (– 1) cm (l:w ratio (2 –) 2.5 – 5 (– 5.6):1), base cuneate, margin thickened and often pale, apex acute, mucronate, margin and midrib beneath yellowish-hispid, hairs along margin with a ± bulbous base forming minute serrations; lateral veins indistinct, midrib prominent beneath; petiole 0 – 4 mm long
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens inserted 12.5 – 18 mm from base of corolla tube; filaments 8 – 12.5 mm long; anthers held at mouth or shortly exserted, 2 – 2.8 mm long; lateral staminodes 1 – 3 mm long, pubescent at base, antherodes 0.3 – 1.3 mm long or absent
Morphology Reproductive morphology Flowers Calyx
Calyx green or mauve-tinged, later scarious, accrescent; anterior lobe suborbicular or somewhat ovate or elliptic, 15 – 21 × 10 – 17 mm in flower, up to 25 × 28 mm in fruit, base rounded or subcordate, margin entire or with minute teeth formed by swollen hair bases, apex obtuse, rounded or subattenuate and mucronulate, rarely bi-mucronulate, surface yellowish-hairy with softer hairs than leaves, dense along the margin; posterior lobe as anterior lobe but broadly ovate (-orbicular), 17 – 26 × 11 – 18 mm in flower, up to 33 × 29 mm in fruit, apex attenuate to obtuse, spinulose; lateral lobes lanceolate, 7 – 9 mm long in flower, up to 11.5 mm in fruit
Morphology Reproductive morphology Flowers Corolla
Corolla 31 – 42 mm long, pale blue to purple with whitish tube, rarely white throughout, glandular-pilose externally; tube cylindrical, 18 – 28 mm long, somewhat expanded towards mouth; limb subregular; lobes (oblong-) obovate to elliptic, 9 – 15 mm long, abaxial and lateral lobes 5 – 9.5 mm wide, adaxial lobes 4 – 7.5 mm wide, all with apices rounded
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary with ring of dense minute crisped white hairs at attachment point of style and extending onto style base; stigma broadly capitate, 0.6 – 1.2 mm wide
Morphology Reproductive morphology Fruits
Capsule 4-seeded, 14.5 – 17 mm long, glabrous; seeds 5 – 5.5 × 5.5 – 6 mm.
Morphology Reproductive morphology Inflorescences
Inflorescences axillary, dense cylindrical or subglobose unilateral cymes 2 – 7.5 cm long in the upper leaf axils, 4 – 10+-flowered; axis sometimes inrolled at fruiting; bracteoles imbricate and largely enclosing the calyces, green, sometimes with white margin, ± broadly ovate, (15 –) 20 – 32 × (7 –) 10 – 20 mm, margin entire or minutely toothed due to swollen hair bases, apex spinulose, surface tripliveined or palmately veined, main veins and margin hispid; paired reduced sterile bracteoles sometimes present at lower nodes
Type
South Africa, [Katrivier] Vet R., in bud Feb., year not recorded, Burke s.n. [cited in error as Burchell in the protologue] (holotype K! [K000394587]; isotype GZU* [GZU000250925]).

Native to:

Botswana, Cape Provinces, Free State, Namibia, Northern Provinces, Zimbabwe

Barleria macrostegia Nees appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Dec 23, 1899 Burke [451], South Africa K000394588 isolectotype
Dec 23, 1899 Burke [457], South Africa K000394589 lectotype
Burke [s.n.], South Africa K000394587 holotype
Burchell, W.J. [2386], KwaZulu-Natal Barleria media K000794965 holotype

First published in A.P.de Candolle, Prodr. 11: 235 (1847)

Accepted by

  • Darbyshire, I., Tripp, E.A. & Chase, F.M. (2019). A taxonomic revision of Acanthaceae tribe Barlerieae in Angola and Namibia. Part 1 Kew Bulletin 74(5): 1-85. Royal Botanic Gardens, Kew.
  • Darbyshire, I., Vollesen, K. & Kelbessa, E. (2015). Flora Zambesiaca 8(6): 1-314. Royal Botanic Gardens, Kew.
  • Govaerts, R. (1996). World Checklist of Seed Plants 2(1, 2): 1-492. MIM, Deurne.

Literature

Kew Bulletin

  • Anderson, T. (1863). An enumeration of the species of Acanthaceae from the continent of Africa and the adjacent islands. J. Proc. Linn. Soc., Bot. 7: 13 – 54.
  • Balkwill, M. J. & Balkwill, K. (1997). Delimitation and infra-generic classification of Barleria (Acanthaceae). Kew Bull. 52: 535 – 573.
  • Clarke, C. B. (1901). Barleria. In: W. T. Thiselton-Dyer (ed.), Flora Capensis. Vol. 5 (Pt. 1): 44 – 55 . L. Reeve & Co., London.
  • Craven, P. (ed.) (1999). A checklist of Namibian plant species. South African Botanical Diversity Network Report No. 7, SABONET, Windhoek.
  • Darbyshire, I. (2015). Barleria. In: J. R. Timberlake & E. S. Martins (eds), Flora Zambesiaca. Vol. 8 (6): 37 – 122. Royal Botanic Gardens, Kew.
  • Darbyshire, I., Tripp, E. A. & Dexter, K. G. (2012). A new species and a revised record in Namibian Barleria (Acanthaceae). Kew Bull. 67: 759 – 766.
  • Dinter, K. (1918). Index der aus Deutsch-Südwestafrika bis zum jahre 1917 bekannt gewordenen pflanzenarten. II. Repert. Spec. Nov. Regni Veg. 15: 340 – 355.
  • Klaassen, E. & Kwembeya, E. (eds) (2013). A checklist of Namibian indigenous and naturalised plants. Occasional Contributions No. 5, National Botanical Research Institute, Windhoek.
  • Klopper, R. R., Chatelain, C., Bänninger, V., Habashi, C., Steyn, H. M., de Wet, B. C., Arnold, T. H., Gautier, L., Smith, G. E. & Spichiger, R. (2006). Checklist of the flowering plants of sub-Saharan Africa. An index of accepted names and synonyms. South African Botanical Diversity Network Report No. 42, SABONET, Pretoria.
  • Mendelsohn, J., Jarvis, A., Roberts, C. & Robertson, T. (2002). Atlas of Namibia. A portrait of the land and its people. Ministry of Environment & Tourism and David Philip, Cape Town.
  • Meyer, P. G. (1957). Beitrag zur Kenntnis der Acanthaceen Südwestafrikas. Mitt. Bot. Staatssamml. München 2: 368 – 385.
  • Meyer, P. G. (1968). 130. Acanthaceae. In H. Merxmüller (ed.), Prodromus einer Flora von Südwestafrika. J. Cramer, Germany.
  • Nees von Esenbeck, C. G. D. (1847). Acanthaceae. In: A. de Candolle (ed.), Prodromus Systematis Naturalis Regni Vegetabilis. Vol. 11: 46 – 51. Masson, Paris.
  • Obermeyer, A. A. (1933). A revision of the South African species of Barleria. Ann. Transvaal Mus. 15: 123 – 180.
  • Sonder, W. (1850). Beiträge zur Flora von Südafrika. Linnaea 23: 1 – 138.
  • Welman, W. G. (2003). Acanthaceae. In: G. Germishuizen & N. L. Meyer (eds), Plants of southern Africa: an annotated checklist. Strelitzia 14: 92 – 106. National Botanical Institute, Pretoria.

Flora Zambesiaca

  • in De Candolle, Prodr. 11: 235 (1847).
  • in Merxmüller, Prodr. Fl. SW Afr. 130: 16 (1968).
  • —Clarke in Fl. Cap. 5: 50 (1901).
  • —Fabian & Germishuizen, Wild Fl. Nthn. S. Afr.: 386, pl.185 (1997).
  • —Meyer in Mitt. Bot. Staatssamml. München 2: 382 (1957).
  • —Obermeijer in Ann. Transv. Mus. 15: 159 (1933).

Kew Backbone Distributions

  • Darbyshire, I., Vollesen, K. & Kelbessa, E. (2015). Flora Zambesiaca 8(6): 1-314. Royal Botanic Gardens, Kew.

Flora Zambesiaca
Flora Zambesiaca
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens
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 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 Bulletin
Kew Bulletin
http://creativecommons.org/licenses/by-nc-sa/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