1. Family: Acanthaceae Juss.
    1. Genus: Barleria L.
      1. Barleria rigida Willd. ex Nees

        This species is accepted, and its native range is S. Namibia to Free State.

    [FZ]

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

    Habit
    Spiny shrublet 10–45 cm tall, much-branched and spreading; stems retrorsely white-puberulent mainly or exclusively on two opposite-decussate sides, nodes often strigose.
    Leaves
    Leaves rather coriaceous, narrowly oblong(-lanceolate), elliptic or rarely ovate, 1–3.2 × 0.3–1 cm, base cuneate, margin white-cartilaginous, sinuate, with or without marginal spines, apex acute and apiculate or spinose, surfaces sparsely yellow-strigose at least along midrib beneath, sometimes also minutely puberulent when young; lateral veins indistinct, midrib prominent beneath; petiole 0–5 mm.
    Inflorescences
    Inflorescence a contracted unilateral cyme 1–2.5 cm long in upper axils, each (1)2–6-flowered; bracteoles green with white margin or whitish throughout, (linear-)lanceolate, 12–25 × 1–4 mm, margin with 4–10 lateral spines per side 1.5–4.5 mm long, apex long-spinose.
    Calyx
    Calyx coriaceous, pale green at first with whitish margin and base, turning whitish throughout; anterior lobe elliptic or lanceolate, 10–16.5 × (3)4–5 mm, base attenuate, margin with 5–13 lateral spines 1.5–4.5 mm long ending in a stiff bristle, apex spinose or bifidly so, surface sparsely strigose and sparsely puberulent or glabrous, palmate-reticulate venation ± prominent; posterior lobe ovate or lanceolate, 12–23 × (3.2)4.5–6 mm, apex attenuate into a long spine; lateral lobes linear-lanceolate, 6–8.5 mm long.
    Corolla
    Corolla 25–33 mm long, white, pink, pale blue or violet, pubescent externally with mixed glandular and eglandular hairs; tube 15–19.5 mm long, cylindrical, very narrowly campanulate towards mouth; limb subregular; abaxial lobe 8–13 × 6.5–9.5 mm; lateral lobes as abaxial but 5.5–8.5 mm wide; adaxial lobes 8.5–15 × 4–7 mm.
    Stamens
    Stamens attached ± midway along corolla tube; filaments 16.5–22 mm long; anthers 1.5–2.5 mm long; lateral staminodes 1.2–2.7 mm long, pubescent at base, antherodes 0.5–0.9 mm long.
    Ovary
    Ovary with ring of minute crisped white hairs at apex and extending onto style base; stigma clavate or subcapitate, 0.4–0.65 mm long, apex bilobed.
    Fruits
    Capsule 9.5–12.5 mm long, glabrous; seeds c.4 mm long and wide.
    Distribution
    Also in Namibia and South Africa (Northern Cape, Free State).
    Ecology
    Sandy pans with dwarf shrubby vegetation, heavily grazed areas; elsewhere recorded from open sandy, gravelly or rocky terrain, e.g. dry riverbeds, dry hillslopes and sand flats; c.1100 m.
    Conservation
    Conservation notes: Widespread and locally common, favouring dry areas with little vegetation; Least Concern.

    Images

    Distribution

    Native to:

    Botswana, Cape Provinces, Free State, Namibia

    Barleria rigida Willd. ex Nees appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Burchell, W.J. [1991], South Africa K000794967 isosyntype
    Schinz, H. [3], South Africa K000794969 syntype
    Barber, M.E. [s.n.], South Africa K000794968

    First published in A.P.de Candolle, Prodr. 11: 242 (1847)

    Accepted by

    • 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

    Flora Zambesiaca
    • —Meyer in Merxmüller, Prodr. Fl. SW Afr. 130: 16 (1968).
    • —Obermeijer in Ann. Transv. Mus. 15: 153 (1933).
    • in De Candolle, Prodr. 11: 242 (1847).
    Kew Backbone Distributions
    • Darbyshire, I., Vollesen, K. & Kelbessa, E. (2015). Flora Zambesiaca 8(6): 1-314. Royal Botanic Gardens, Kew.

    Sources

    Flora Zambesiaca
    Flora Zambesiaca
    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.
    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 2019. 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 2019. 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