1. Family: Poaceae Barnhart
    1. Genus: Orthacanthus P.M.Peterson & Romasch.
      1. Orthacanthus pedunculatus (Pilg.) P.M.Peterson & Romasch.

        This species is accepted, and its native range is Namibia to Botswana.

    [GB]
    Habit
    Annual; mat forming. Culms erect, or geniculately ascending; 10-40 cm long. Ligule a fringe of hairs. Leaf-blades 20-60 cm long; 2 mm wide.
    Inflorescences
    Inflorescence composed of racemes. Racemes 2-8; borne along a central axis; distant; spreading; cuneate; 1.1-2.2 cm long; bearing few fertile spikelets; bearing 1-4 fertile spikelets on each. Central inflorescence axis 2.5-5 cm long. Rhachis evident; deciduous from axis; subterete; terminating in a barren extension; extension subulate. Raceme-bases linear; 4-12 mm long; pubescent. Spikelets solitary. Fertile spikelets pedicelled. Pedicels linear, or oblong; flattened; 1-2.5 mm long; ciliate.
    Sterile
    Apical sterile spikelets rudimentary; 1-2 in number (per raceme).
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; acuminate; 6-10 mm long; falling entire; deciduous with accessory branch structures. Apical sterile spikelets rudimentary; 1-2 in number (per raceme).
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; acuminate; 6-10 mm long; falling entire; deciduous with accessory branch structures.
    Glume
    Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume ovate; 1-2 mm long; 0.2 length of upper glume; hyaline; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 6-10 mm long; 1.1 length of adjacent fertile lemma; membranous; without keels; 7 -veined. Upper glume lateral veins thickened; ribbed. Upper glume surface setose; hairy on veins; with tubercle-based hairs. Upper glume apex acuminate.
    Florets
    Fertile lemma lanceolate; dorsally compressed; 5-8 mm long; membranous; without keel; 3 -veined. Lemma apex acuminate. Palea 2 -veined.
    Flowers
    Lodicules 2; cuneate; fleshy. Anthers 3.
    Fruits
    Caryopsis with adherent pericarp; ellipsoid; dorsally compressed; biconvex.
    Distribution
    Africa: south.
    Reference
    Cynodonteae. WDC.
    [FZ]

    Gramineae, T. Cope. Flora Zambesiaca 10:2. 1999

    Habit
    Annual up to 20 cm tall, erect or ascending; leaf laminas 1.2–2.5 × 1 mm, plicate, the margins strongly thickened, whitish, sparsely pectinate below, smooth or barbellate above.
    Inflorescences
    Inflorescence up to 6 cm long, very lax, with only 4–7 racemelets comprising up to 4 fertile and 1 sterile spikelets, erect or deflexed on a peduncle 5–7 mm long.
    Spikelets
    Spikelets 6–7(10) mm long; superior glume prominently 7–9-nerved, alternate nerves bearing long straight or curved, but not hooked, bulbous-based prickles, glabrous between the nerves; anthers 0.9–1.3 mm long.

    Distribution

    Native to:

    Botswana, Namibia

    Orthacanthus pedunculatus (Pilg.) P.M.Peterson & Romasch. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Story, R. [6412], Namibia Tragus pedunculatus K000496684
    Wild, H. [6947], Botswana Tragus pedunculatus K000496687
    Smith, P.A. [3889], Botswana Tragus pedunculatus K000496688
    Ellis, R.P. [2700], Botswana Tragus pedunculatus K000496689
    Schweickerdt, H.G. [2071], Namibia Tragus pedunculatus K000496685
    Schweickerdt, H.G. [2142], Namibia Tragus pedunculatus K000496686

    First published in Taxon 65: 1277 (2016)

    Accepted by

    • Govaerts, R. (2019). World Checklist of Vascular Plants (WCVP Database) The Board of Trustees of the Royal Botanic Gardens, Kew.

    Literature

    Kew Backbone Distributions
    • Cope, T. (1999). Flora Zambesiaca 10(2): 1-261. Royal Botanic Gardens, Kew.

    Sources

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

    GrassBase - The Online World Grass Flora
    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.

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2020. 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 2020. 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