1. Family: Poaceae Barnhart
    1. Genus: Diplachne P.Beauv.
      1. Diplachne gigantea Launert

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

    [FTEA]

    Gramineae, W. D. Clayton, S. M. Phillips & S. A. Renvoize. Flora of Tropical East Africa. 1974

    Habit
    Robust aquatic rhizomatous perennial with stout erect culms 160–270 cm. high.
    Leaves
    Leaf-blades tough, linear with filiform tips, 30–65 cm. long, 4–5 mm. wide, flat or inrolled, scabrid, grey-green with a conspicuous broad white midrib; ligule 4–6 mm. long, pointed, soon becoming lacerate.
    Inflorescences
    Inflorescence 23–40 cm. long, composed of 20–50 slender slightly flexuous racemes; racemes 12–20 cm. long, loosely ascending to widely spreading.
    Spikelets
    Spikelets 8–15-flowered, narrowly oblong, 10–14 mm. long, slightly overlapping, olive-grey; glumes lanceolate to narrowly oblong, keeled, scaberulous on the keels, subacute, the lower 2.2–3.2 mm. long, the upper 3.2–3.8 mm. long; lemmas narrowly oblong, 3.6–4.8 mm. long, obscurely appressed pilose near the margins in the lower half, otherwise glabrous, entire, acuminate with the midnerve extended into a mucro 0.25–0.5 mm. long; anthers 1.4–2.1 mm. long.
    Fruits
    Caryopsis elliptic-oblong, 1.5–2 mm. long, dorso-ventrally flattened.
    Habitat
    Aquatic grass of river margins; 2000 m.
    Distribution
    T7
    [GB]
    Habit
    Perennial. Rhizomes elongated. Culms erect; 160-270 cm long. Ligule an eciliate membrane; 4-6 mm long; lacerate; acute. Leaf-blades flat, or convolute; 30-65 cm long; 4-5 mm wide; stiff; mid-green and grey-green. Leaf-blade midrib widened. Leaf-blade surface scabrous. Leaf-blade apex attenuate; filiform.
    Inflorescences
    Inflorescence composed of racemes. Racemes numerous; 20-50; borne along a central axis; spreading, or ascending; flexuous; unilateral; 12-20 cm long. Central inflorescence axis 13-30 cm long. Rhachis semiterete. Spikelet packing broadside to rhachis; lax. Spikelets solitary. Fertile spikelets pedicelled, or sessile. Pedicels filiform.
    Spikelets
    Spikelets comprising 8-15 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; compressed slightly; 10-14 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes eventually visible between lemmas.
    Fertile
    Spikelets comprising 8-15 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; compressed slightly; 10-14 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes eventually visible between lemmas.
    Glume
    Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate, or oblong; 2.2-3.2 mm long; 0.7-0.8 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate, or oblong; 3.2-3.8 mm long; 0.8-0.9 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acute; mucronate.
    Florets
    Fertile lemma oblong; 3.6-4.8 mm long; membranous; dark green, or grey; without keel; 3 -veined. Lemma midvein eciliate. Lemma lateral veins close to margins. Lemma margins pubescent; hairy below. Lemma apex entire; acuminate; mucronate (0.25-0.5mm). Palea 2 -veined. Palea keels scabrous. Palea surface pubescent; hairy on flanks. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Lodicules 2; cuneate; fleshy. Anthers 3; 1.4-2.1 mm long.
    Fruits
    Caryopsis with adherent pericarp; ellipsoid, or oblong; flattened; concavo-convex; 1.5-2 mm long.
    Distribution
    Africa: east tropical, southern tropical, and south.
    Reference
    Eragrostideae. FTEA.
    [FZ]

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

    Habit
    Robust rhizomatous perennial with stout erect culms up to 270 cm tall; ligule a pointed membrane; leaf lamina tough, 30–65 cm × 4–5 mm, linear, flat or involute, greyish-green with broad white midrib, tapering to a filiform apex.
    Inflorescences
    Inflorescence 23–40 cm long, open; racemes numerous, slender, 12–20 cm long, slightly flexuous, loosely ascending to widely spreading.
    Spikelets
    Spikelets 8–15-flowered, 10–14 mm long, narrowly oblong, slightly overlapping; glumes unequal, keeled, lanceolate to narrowly oblong, subacute, the inferior 2.2–3.2 mm long, the superior 3.2–3.8 mm long; lemmas 3.6–4.8 mm long, narrowly oblong, dorsally rounded, obscurely appressed-pilose near the margins below, otherwise glabrous, entire and acuminate at the apex with the midnerve excurrent into a mucro 0.25–0.5 mm long.
    Fruits
    Caryopsis 1.5–2 mm long, elliptic-oblong, dorsiventrally flattened.

    Images

    Distribution

    Native to:

    Angola, Botswana, Caprivi Strip, Tanzania, Zambia, Zimbabwe

    Diplachne gigantea Launert appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Apr 1, 1934 Vesey-Fitzgerald, D. [1551], Zambia Leptochloa gigantea K000366660 holotype

    First published in Bol. Soc. Brot., sér. 2.A, 47: 349 (1973)

    Not accepted by

    • Govaerts, R. (2000). World Checklist of Seed Plants Database in ACCESS D: 1-30141. [Cited as Leptochloa gigantea.]

    Literature

    Kew Backbone Distributions
    • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
    • Cope, T. (1999). Flora Zambesiaca 10(2): 1-261. Royal Botanic Gardens, Kew.
    • Clayton, W.D., Phillips, S.M., Renvoize, S.A. (1974). Gramineae Flora of Tropical East Africa 2: 177-449.
    Flora of Tropical East Africa
    • Launert in Bol. Soc. Brot., sér. 2, 47:349 (1974).

    Sources

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

    Flora of Tropical East Africa
    Flora of Tropical East Africa
    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.
    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 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