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This species is accepted, and its native range is Angola.

[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 is clearly highly range-restricted and scarce, as it has only been collected twice despite occurring in the well botanised region of the Lubango Highlands. It was recorded as uncommon by B. Teixeira and occasional by S. P. Bester. However, from the very limited information available, it appears to be tolerant of some disturbance. It is currently considered to be Data Deficient — DD, but may well prove to be threatened in view of the high population pressure and resultant degradation and loss of habitat in the Lubango area.
Distribution
Endemic to southwestern Angola (Huíla Prov.).
Ecology
Barleria crabbeoides has been recorded from open disturbed grassland on well-drained sandy soils and along lake margins; c. 1900 – 2050 m elevation. It occurs, so far as is known, only in the Lubango highlands of the Huíla plateau in southwestern Angola. The Huíla plateau is a known centre of plant endemism (Exell & Gonçalves 1973; Linder 2001; Figueiredo 2008) and the Lubango Highlands are particularly rich in endemic species, with potentially as many as 200 species unique to this area (D. J. Goyder & F. M. P. Gonçalves, unpubl. data).
Morphology General Habit
Rhizomatous perennial herb, up to 10 cm tall; rhizome short, somewhat woody and with numerous fleshy adventitious roots; aerial stems with few contracted internodes up to 1.5 cm long, with dense appressed or ascending pale-buff hairs
Morphology Leaves
Leaves subrosulate with 2 – 4 pairs, sessile or petiole to 6 mm long; blade elliptic or basal-most pairs obovate, largest leaves 4.5 – 7.2 × 1.5 – 2.6 cm (l:w ratio 2.1 – 3.1:1), base cuneate or attenuate, margin entire, apex acute, obtuse or basal-most leaves rounded; surfaces with numerous pale buff hairs throughout; lateral veins 5 – 7 pairs, prominent beneath
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens inserted in upper half of corolla tube; filaments c. 9 mm long; anthers held at corolla mouth, 1.8 – 2.5 mm long; lateral staminodes c. 4 mm long, pilose, antherodes c. 0.9 mm long
Morphology Reproductive morphology Flowers Calyx
Calyx brown or green-brown in dry state, with darker subparallel primary venation; anterior lobe obovate-elliptic, c. 15 – 16 × 6 mm, base attenuate, margin minutely spinulose-dentate, teeth with an apical bristle, apex acute, external surface with numerous subappressed pale buff hairs mainly along the primary veins and margin; posterior lobe as anterior lobe but elliptic, c. 16 – 17 × 6.5 mm; lateral lobes linear-lanceolate, c. 9 – 10 mm long
Morphology Reproductive morphology Flowers Corolla
Corolla blue or purple, drying blue-black, pilose externally; tube cylindrical, 18 – 25 mm long; limb in “2+3” configuration; abaxial and lateral lobes obovate-elliptic, c. 9.5 – 12 × 5 – 8 mm, apices rounded or shallowly emarginate, adaxial lobes somewhat narrower, up to 11.5 × 6 mm
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary glabrous; style with a few buff-coloured hairs at base and with scattered minute stalked-glands towards apex; stigma clavate, 0.6 – 0.8 mm long
Morphology Reproductive morphology Fruits
Capsule not seen but considered likely to be 4-seeded in view of its affinities.
Morphology Reproductive morphology Inflorescences
Inflorescences of sessile single-flowered cymes, often contracted into a few-flowered head; bracteoles (and bracts within the head) oblong-obovate or oblong-elliptic, 16 – 20 × 5 – 6 mm, base attenuate, margin with minute teeth formed by swollen hair bases, apex obtuse or acute, indumentum as leaves
Note
The species epithet “crabbeoides” refers to the fact that this plant superficially resembles a species of the genus Crabbea in terms of its rosulate habit and capitate inflorescence. Only two specimens of this very distinctive species have been seen to date, and no full floral dissection has been possible, hence the measurements of the corolla and androecium are currently incomplete. However, as this species is so distinct, it seemed wrong to leave it undescribed. This species differs from all known species of Barleria in having the combination of a rhizomatous, subrosulate habit and a capitate or contracted inflorescence with non-spiny bracts and calyces. This new species is unlikely to be confused with any other species of Barleria because of its unique subrosulate habit. It is unusual for subg. Barleria in that it lacks spines and has the cymes ± crowded into a terminal head. However, whilst no fruits are available to confirm this sectional placement, it seems very likely to be correct in view of the “2+3” corolla configuration with a cylindrical tube, the presence of antherodes on the lateral staminodes and the clavate stigma, a combination found only in subg. Barleria. Other non-spiny species are recorded in subg. Barleria, including the recently described B. fissimuroides I. Darbysh. from Mozambique and Zimbabwe (Darbyshire 2015) which has a similar indumentum, corolla form and similarly shaped bracteoles to B. crabbeoides but is otherwise very different in, for example, habit, leaf size and shape as it is a shrub to 1 m tall with well-spaced decussate, long-petiolate leaves 8 – 11 × 3 – 4.7 cm.
Type
Angola, Huíla Prov., Polygonal Florestal da Humpata, c. 5 km NE of Humpata, c. 8 km SW of Lubango, fl. 26 Jan. 2009, Bester 9271 (holotype PRE!; isotype LUBA!).

Native to:

Angola

Barleria crabbeoides I.Darbysh. appears in other Kew resources:

First published in Kew Bull. 74(1)-5: 57 (2019)

Accepted by

  • Darbyshire, I., Manzitto-Tripp, E.A. & Chase, F.M. (2021). A taxonomic revision of Acanthaceae tribe Barlerieae in Angola and Namibia. Part 2 Kew Bulletin 76: 127-190. Royal Botanic Gardens, Kew.
  • Govaerts, R., Nic Lughadha, E., Black, N., Turner, R. & Paton, A. (2021). The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. https://doi.org/10.1038/s41597-021-00997-6 Scientific Data 8: 215.

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  • Struwig, M., Klaassen, E. & Kwembeya, E. G. (2015). Nyctaginaceae: a taxonomic treatment for the Flora of Namibia. Phytotaxa 238: 101 – 135.
  • Teixeira, J. B. (1968). Angola. In: I. Hedberg & O. Hedberg (eds), Conservation of Vegetation in Africa South of the Sahara. Proceedings of a symposium held at the 6th Plenary meeting of the “Association pour l’Etude Taxonomique de la Flore d’Afrique Tropicale” (AETFAT) in Uppsala, Sept. 12th – 16th, 1966. Acta Phytogeogr. Suecica 54: 193 – 197. Almqvist & WiksellsBoktryckeri AB, Uppsala.
  • Tripp, E. A. & Darbyshire, I. (2017). Phylogenetic relationships among Old World Ruellia L.: a new classification and reinstatement of the genus Dinteracanthus Schinz. Syst. Bot. 42: 470 – 483.
  • Tripp, E. A. & Dexter, K. G. (2012). Taxonomic novelties in Namibian Ruellia (Acanthaceae). Syst. Bot. 37: 1023 – 1030.
  • Tripp, E. A., Daniel, T. F., Fatimah, S. & McDade, L. A. (2013). Phylogenetic relationships within Ruellieae (Acanthaceae) and a revised classification. Int. J. Pl. Sci. 174: 97 – 137.
  • Tripp, E. A., Tsai, Y.-H. E., Zhuang, Y. & Dexter, K. (2017). RADseq dataset with 90% missing data fully resolves recent radiation of Petalidium (Acanthaceae) in the ultra-arid deserts of Namibia. Ecol. Evol. 7: 7920 – 7936. DOI: 10.1002/ece3.3274.
  • Van Wyk, A. E. & Smith, G. F. (2001). Regions of Floristic Endemism in Southern Africa. A review with emphasis on succulents. Umdaus Press, Hatfield.
  • Verdcourt, B. (1969). The arid corridor between the north-east and south-west areas of Africa. In: E. M. van Zinderen Bakker (ed.), Palaeoecology of Africa and of the surrounding islands and Antarctica. Vol. 4: 140 – 144. A. A. Balkema, Cape Town.
  • Vollesen, K. (2008). Acanthaceae (Part 1). In: H. J. Beentje & S. A. Ghazanfar (eds), Flora of Tropical East Africa. Royal Botanic Gardens, Kew.
  • Vollesen, K. (2013). Acanthaceae (Part 1). In: J. R. Timberlake & E. S. Martins (eds), Flora Zambesiaca. Vol. 8 (5). Royal Botanic Gardens, Kew.
  • 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.
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Kew Backbone Distributions

  • Darbyshire, I., Manzitto-Tripp, E.A. & Chase, F.M. (2021). A taxonomic revision of Acanthaceae tribe Barlerieae in Angola and Namibia. Part 2 Kew Bulletin 76: 127-190. 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