1. Family: Poaceae Barnhart
    1. Oropetium Trin.

      1. This genus is accepted, and its native range is Africa, Arabian Peninsula Indian Subcontinent to Indo-China.

    [GB]

    nonem

    Habit
    Annual (3), or perennial (3). Culms erect; 1-8.416-25 cm long. Ligule an eciliate membrane (1), or a ciliolate membrane (4), or a ciliate membrane (1). Leaf-blades filiform (3), or linear (3); stiff (3), or firm (3).
    Inflorescences
    Inflorescence composed of racemes; not deciduous as a whole (5), or deciduous as a whole (1); exserted (4), or embraced at base by subtending leaf (2). Racemes single; unilateral (1/3), or bilateral (3/3). Rhachis tough (2), or fracturing into irregular segments (3), or fragile at the nodes (1); semiterete (1), or subcylindrical and excavated (5). Spikelet packing adaxial; 2 -rowed. Rhachis internodes indefinite (5), or linear (1). Spikelets sunken; solitary. Fertile spikelets sessile.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension (5), or with a barren rhachilla extension (1), or with diminished florets at the apex (1). Spikelets lanceolate (5), or elliptic (1); dorsally compressed; 1.66-2.956-4.8 mm long; falling entire (1), or breaking up at maturity (5); deciduous with accessory branch structures (1/1); disarticulating below each fertile floret (5/5). Floret callus pubescent.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension (5), or with a barren rhachilla extension (1), or with diminished florets at the apex (1). Spikelets lanceolate (5), or elliptic (1); dorsally compressed; 1.66-2.956-4.8 mm long; falling entire (1), or breaking up at maturity (5); deciduous with accessory branch structures (1/1); disarticulating below each fertile floret (5/5). Floret callus pubescent.
    Glume
    Glumes one the lower absent or obscure (1), or two; deciduous (5/5); reaching apex of florets (1), or exceeding apex of florets (5); firmer than fertile lemma; parallel to lemmas (5), or recurved at apex (4). Lower glume linear (1), or oblong (4), or orbicular (1); 0-0.2167-0.5 length of upper glume; hyaline; without keels; 0 -veined (5), or 1 -veined (1). Lower glume lateral veins absent. Lower glume apex truncate (4/5), or obtuse (1/5), or acute (1/5). Upper glume lanceolate (5), or elliptic (1); 1-1.508-3 length of adjacent fertile lemma; herbaceous (3), or coriaceous (3); with undifferentiated margins (5), or hyaline margins (1); without keels; 1-2 -veined (1), or 3 -veined. Upper glume lateral veins without ribs (4), or ribbed (2). Upper glume apex obtuse (1), or acute (3), or acuminate (2); muticous (4), or awned (2); 1 -awned (2/2).
    Florets
    Fertile lemma elliptic (2), or oblong (4), or obovate (1); hyaline (2), or membranous (4); without keel; 1-2 -veined (1), or 3 -veined. Lemma surface glabrous (4), or pubescent (1), or pilose (1). Lemma apex entire (1), or dentate (5); 2 -fid (5/5), or 3 -fid (1/5); truncate (1/1); muticous (2), or mucronate (3), or awned (1); 1 -awned (1/1). Principal lemma awn apical (3/4), or from a sinus (1/4). Palea 1 length of lemma; hyaline; 2 -veined. Palea surface glabrous (5), or pilose (1). Palea apex muticous (5), or with excurrent keel veins (1). Apical sterile florets 1 in number (1/1); male (1/1); oblong (1/1).
    Flowers
    Anthers 3 (2/2).
    Fruits
    Caryopsis with tardily free pericarp; fusiform (3/5), or ellipsoid (1/5), or oblong (1/5), or obovoid (1/5).
    Distribution
    Africa (4), or Temperate Asia (3), or Tropical Asia (3).
    [FTEA]

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

    Habit
    Small tufted perennials with fibrous or papery remains of old leaf-sheaths at the base, rarely annuals
    Leaves
    Leaf-blades linear, flat, rolled or folded, obtuse to finely acute, sparsely to densely pilose or subglabrous
    Inflorescences
    Inflorescence a single slender straight, curved or coiled, terminal spike bearing spikelets embedded in hollows arranged alternately in 2 opposite, subopposite or adjacent ranks; rhachis slender, spongy or herbaceous, tough or fracturing horizontally into segments of 1–4(–8) spikelets
    Spikelets
    Spikelets 1–2-flowered (1-flowered in East African species); lower glume adaxial, minute, hyaline and nerveless, rarely absent (resembling the upper in the terminal spikelet); upper glume abaxial, usually appressed to the rhachis, exceeding and covering the floret, lanceolate, herbaceous and tough, (1–)3-nerved, acute to finely awned; lemma elliptic, oblong or obovate when flattened, membranous, 1–3-nerved, keeled, apex 2-toothed and mucronate, the mucro rarely produced into an awn
    Fruits
    Caryopsis elliptic-oblong or obovate.
    [FZ]

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

    Inflorescences
    Inflorescence a single straight or coiled terminal raceme bearing spikelets in hollows arranged alternately in 2 opposite, subopposite or adjacent ranks; rhachis slender, spongy or herbaceous, tough or fracturing into segments of 1–4(8) spikelets.
    Spikelets
    Spikelets sessile, dorsally compressed, 1-flowered (rarely with an additional male floret; not in Flora Zambesiaca area), with or without a minute rhachilla extension concealed in the callus hairs; glumes very unequal, the inferior abaxial, minute, hyaline and nerveless, rarely absent (resembling the superior in the terminal spikelet), the superior adaxial, appressed to the rhachis, exceeding and concealing the floret, lanceolate, coriaceous, (1)3-nerved, acute to awned; callus long pilose; lemma hyaline, 3-nerved, lightly keeled, glabrous to pilose, emarginate to 2-toothed at the apex, mucronate or rarely awned.
    Fruits
    Caryopsis elliptic-oblong or obovate, with reluctantly separable pericarp.

    Images

    Distribution

    Native to:

    Angola, Bangladesh, Benin, Botswana, Burkina, Cape Provinces, Chad, Ethiopia, Free State, Gambia, Ghana, Guinea-Bissau, India, Ivory Coast, Kenya, KwaZulu-Natal, Lesotho, Libya, Mali, Mauritania, Morocco, Mozambique, Myanmar, Namibia, Niger, Northern Provinces, Oman, Pakistan, Saudi Arabia, Senegal, Somalia, Sri Lanka, Sudan, Tanzania, Togo, Vietnam, West Himalaya, Western Sahara, Yemen, Zambia, Zimbabwe

    Oropetium Trin. appears in other Kew resources:

    First published in Fund. Agrost.: 98 (1820)

    Literature

    Flora of West Tropical Africa
    • Fund. Agrost. 98, t. 3 (1820).
    Flora Zambesiaca
    • S.M. Phillips in Kew Bull. 30: 467–470 (1975).
    • Fund. Agrost.: 98 (1820).
    Flora of Tropical East Africa
    • Fund. Agrost.: 98 (1820)

    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

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2018. 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 2018. 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