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

[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 species has a rather narrow range in the Kaokoveld Centre of Endemism, with an EOO of 56,265 km2. It has only very recently been discovered in Angola and was previously thought to be a Namibian endemic (Darbyshire et al. 2012). It has been recorded as locally common or abundant by several plant collectors, and was found by the first author to be frequent in the dolomite ridge north of Fransfontein. Much of its range falls within communal livestock farming areas and there is a possible impact to some populations from high browsing pressure from goats. However, it is not considered to be globally threatened and is assessed as of Least Concern — LC.
Distribution
Southwestern Angola (Namibe prov.); Northwestern Namibia (Kunene region).
Ecology
Barleria meeuseana occurs in woodlands and wooded areas that are transitional to savannas. It commonly occurs on rocky slopes and outcrops (koppies) of granite or dolomite, growing amongst boulders or in rock crevices in dry open bushland of Acacia, Commiphora, Colophospermum mopane, Boscia and Adenolobus; it is also recorded from dry stony riverbeds; 800 – 1475 m elevation. It is restricted to the Kaokoveld Centre of plant endemism (sensu van Wyk & Smith 2001). In Namibia, it occurs primarily in the Western Highlands vegetation type of Mendelsohn et al. (2002).
Morphology General Habit
Slender spiny shrub or shrublet, erect to straggling, 20 – 120 (– 200) cm tall, rather slender; stems soon turning woody, sparsely to more densely white-puberulent, with interspersed long ascending buff-coloured hairs with a ± swollen base
Morphology Leaves
Leaves obovate, elliptic or lanceolate, 0.7 – 2.4 × 0.25 – 1 cm (l:w ratio 1.6 – 2.9:1), base cuneate to obtuse, margin usually with prominent spinulose teeth formed by swollen and elongated hair bases, apex acute or subattenuate to rounded, prominently mucronate, veins beneath and margin strigose, surfaces puberulous at least when young; lateral veins 3 – 4 pairs; petiole 0 – 3 mm long
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens inserted ± midway along corolla tube; filaments c. 13 – 20 mm long; anthers 1.7 – 2.2 mm long; lateral staminodes 1 – 2.5 mm long, pubescent only at base, antherodes well developed, 0.7 – 1 mm long
Morphology Reproductive morphology Flowers Calyx
Calyx at first green to mauve, soon turning pale-scarious; anterior lobe lanceolate to narrowly so, 10 – 14 × 1.8 – 3.7 mm, base cuneate, margin with 2 – 6 slender spines per side 1.5 – 4 mm long, apex spinose or bispinose, external surface glandular-puberulous, densely so when young, with or without interspersed short patent eglandular hairs, veins strigose; posterior lobe like anterior lobe but 11 – 16 mm long, apex long-spinose; lateral lobes linear-lanceolate, 7.5 – 10 mm long
Morphology Reproductive morphology Flowers Corolla
Corolla 22.5 – 28 mm long, lilac, pale blue or mauve, fading to white, with deep mauve markings in roof of throat; pubescent externally, lateral lobes of limb with mixed short eglandular and long glandular hairs; tube 13 – 16.5 mm long, cylindrical, barely widened towards mouth; limb subregular but with abaxial lobe offset by 2 – 2.5 mm; abaxial lobe obovate to broadly so, 8 – 10.5 × 5.5 – 7 mm, apex rounded or slightly emarginate; lateral lobes obovate to elliptic, 6.5 – 11 × 5 – 6.5 mm, apex rounded or obtuse; adaxial lobes like laterals but 4 – 5 mm wide, apex acute to rounded
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary with a ring of dense minute crisped white hairs at attachment point of style; style glabrous; stigma linear, 0.5 – 1 mm long
Morphology Reproductive morphology Fruits
Capsule 4-seeded, 9.5 – 13 mm long, glabrous; seeds 3.7 – 4 × 3.2 – 3.4 mm.
Morphology Reproductive morphology Inflorescences
Inflorescences axillary, contracted unilateral cymes 1 – 4 cm long, each (2 –) 4 – 8 (– 20)-flowered; bracts foliaceous; bracteoles lanceolate-spinose, pairs somewhat unequal in length, the longer 9.5 – 14 (– 18) × 0.5 – 1.3 mm, blade at first green or pinkish but turning scarious, midrib pale and prominent, margin with (1 –) 2 – 4 ± patent lateral spines per side 1.5 – 3 mm long, surface glandular-puberulous, midrib often strigose; sterile bracteoles persisting at lower nodes as paired or clustered axillary spines
Note
This species is sometimes beset with characteristic galls, these being pyriform and densely hirsute with bright green to golden hairs. The glandular hairs on the calyces of the type specimen are less dense than is usual for this species; this is also the case on the single Angolan specimen seen. Story 5874 is unusual in having up to c. 12 – 20 flowers per cyme, compared to a maximum of c. 8 flowers in the other material seen.
Type
Namibia, Ombepera, fl. 10 April 1957, de Winter & Leistner 5489 (holotype M! [M0109632]; isotypes PRE, WIND! [WIND000031675]).

Native to:

Angola, Namibia

Barleria meeuseana P.G.Mey. appears in other Kew resources:

First published in Mitt. Bot. Staatssamml. München 4: 59 (1961)

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.
  • Govaerts, R. (1996). World Checklist of Seed Plants 2(1, 2): 1-492. MIM, Deurne.

Literature

Kew Bulletin

  • Craven, P. (ed.) (1999). A checklist of Namibian plant species. South African Botanical Diversity Network Report No. 7, SABONET, Windhoek.
  • 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.
  • 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. (1961). Beiträge zur Kenntnis der Acanthaceen Südwestafrikas (III). Mitt. Bot. Staatssamml. München 4: 59 – 72.
  • Meyer, P. G. (1968). 130. Acanthaceae. In H. Merxmüller (ed.), Prodromus einer Flora von Südwestafrika. J. Cramer, Germany.
  • Van Wyk, A. E. & Smith, G. F. (2001). Regions of Floristic Endemism in Southern Africa. A review with emphasis on succulents. Umdaus Press, Hatfield.

Kew Backbone Distributions

  • 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.

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