1. Family: Poaceae Barnhart
    1. Leersia Sw.

      1. This genus is accepted, and its native range is Cosmopolitan.

    [GB]

    nonem

    Habit
    Annual (5), or perennial (15). Rhizomes absent (11/17), or short (1/17), or elongated (8/17). Culms erect (3/17), or geniculately ascending (10/17), or decumbent (12/17), or prostrate (1/17); 15-69.58-200 cm long; spongy (1), or firm (17); without nodal roots (2/7), or rooting from lower nodes (7/7). Culm-nodes constricted (1/1). Lateral branches lacking (3/3), or sparse (1/3). Leaf-sheath auricles absent (14), or erect (4). Ligule an eciliate membrane. Leaf-blades filiform (1), or linear (17), or lanceolate (1); stiff (1), or firm (14), or flaccid (3).
    Inflorescences
    Inflorescence a panicle; exserted (16), or embraced at base by subtending leaf (4), or enclosed (1). Panicle open (17), or contracted (1). Spikelets solitary. Fertile spikelets sessile (1), or pedicelled (17). Pedicels oblong (3/3).
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear (1), or lanceolate (1), or elliptic (6), or oblong (9), or ovate (3), or orbicular (1); laterally compressed; 1.5-3.931-8 mm long; falling entire. Spikelet callus brief (16), or oblong (2); base obtuse (1/1).
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear (1), or lanceolate (1), or elliptic (6), or oblong (9), or ovate (3), or orbicular (1); laterally compressed; 1.5-3.931-8 mm long; falling entire. Spikelet callus brief (16), or oblong (2); base obtuse (1/1).
    Glume
    Glumes both absent or obscure.
    Florets
    Fertile lemma linear (1/2), or elliptic (1/2), or oblong (1/2); chartaceous; keeled; 5 -veined. Lemma midvein without distinctive roughness (16), or scaberulous (1), or scabrous (1); eciliate (5), or ciliolate (5), or ciliate (5), or pectinately ciliate (4), or setose (1). Lemma surface smooth (15), or scaberulous (2), or scabrous (2); glabrous (15), or puberulous (1), or pubescent (5), or hispidulous (2); with simple hairs (6/8), or semicircular hairs (2/8). Lemma margins involute; eciliate (17), or ciliolate (1), or ciliate (2). Lemma apex obtuse (2/12), or acute (8/12), or rostrate (2/12); muticous (14), or awned (4); 1 -awned (4/4). Palea 1-1.005-1.1 length of lemma; chartaceous; 3 -veined; 1-keeled. Palea keels smooth (15), or scaberulous (2), or scabrous (1); eciliate (7), or ciliolate (4), or ciliate (6), or pectinate (2). Palea surface glabrous (16), or pubescent (3). Palea apex entire (12/12); muticous (15), or awned (3).
    Flowers
    Lodicules 2. Anthers 1 (1), or 2 (4), or 3 (3), or 6 (11). Stigmas 2.
    Fruits
    Caryopsis with adherent pericarp (2/2); ellipsoid (1/2), or ovoid (1/2). Embryo 0.4 length of caryopsis.
    Distribution
    Europe (1), or Africa (11), or Temperate Asia (4), or Tropical Asia (3), or Australasia (2), or North America (6), or South America (4).
    [FTEA]

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

    Habit
    Mostly perennials with creeping rhizomes; culms slender, often geniculate and ascending, up to ± 60 cm. high
    Leaves
    Leaf-blades flat or convolute, often harshly scabrid on the margins; ligule membranous
    Inflorescences
    Panicle spreading, oblong, the spikelets shortly pedicelled and imbricate
    Spikelets
    Spikelets 1-flowered, strongly laterally compressed, falling entire from the pedicel; glumes absent or represented by an obscure frill at the pedicel-tip; lemma chartaceous, boat-shaped, usually 5-nerved, typically spinulose-scabrid, muticous, rarely subulate-caudate or awned; palea resembling the lemma, but narrower and usually 3-nerved; stamens (1–3–)6; stigmas 2.
    [FZ]

    Gramineae, E. Launert. Flora Zambesiaca 10:1. 1971

    Spikelets
    Spikelets shortly pedicelled or subsessile, 1-flowered, hermaphrodite, laterally compressed, deciduous; rhachilla articulating above the rudimentary glumes.
    Lemma
    Sterile lemmas not present; fertile lemma cymbiform, strongly keeled, 5-nerved (one pair of nerves very close to the margins), chartaceous to coriaceous, awnless or tapering in a cauda or pseudo-awn; keels and margins usually stiffly ciliate more rarely scabrous or smooth.
    Palea
    Palea narrower and slightly shorter than the lemma but of both the same consistency and indument but with the margins usually hyaline, tightly clasped by the margins of the lemma, apex obtuse, acute, acuminate or drawn out into a short cauda.
    Lodicules
    Lodicules 2, very small, finely nerved.
    Stamens
    Stamens 6 (in all species of the Flora Zambesiaca area), 3 or rarely 2 with the filaments free.
    Pistil
    Ovary glabrous; stigmas plumose, laterally exserted.
    Fruits
    Caryopsis remaining tightly enclosed between lemma and palea, oblong, elliptic-oblong to ovate in outline, laterally compressed, whitish to dark brown in colour, embryo very small; hilum long, linear.
    Habit
    Annual or perennial grasses, growing in a variety of moist habitats, often stoloniferous.
    Stem
    Culms erect or straggling; nodes almost always hairy to a varying degree.
    Ligules
    Ligule membranous, entire or sometimes lacerate, usually glabrous.
    Inflorescences
    Inflorescence an open or contracted panicle with slender branches; the spikelets often densely imbricate.

    Images

    Distribution

    Doubtfully present in:

    Canary Is., Sakhalin

    Native to:

    Alabama, Albania, Algeria, Altay, Andaman Is., Angola, Argentina Northeast, Argentina Northwest, Arizona, Arkansas, Assam, Austria, Azores, Baltic States, Bangladesh, Belarus, Belgium, Belize, Benin, Bolivia, Borneo, Botswana, Brazil North, Brazil South, Brazil Southeast, Brazil West-Central, British Columbia, Bulgaria, Burkina, Burundi, California, Cameroon, Cape Provinces, Caprivi Strip, Central African Repu, Central European Rus, Chad, China North-Central, China South-Central, China Southeast, Colombia, Colorado, Congo, Connecticut, Corse, Costa Rica, Cuba, Czechoslovakia, Delaware, Denmark, District of Columbia, Dominican Republic, East European Russia, East Himalaya, Ecuador, Egypt, El Salvador, Eritrea, Ethiopia, Finland, Florida, France, Free State, French Guiana, Gabon, Gambia, Georgia, Germany, Ghana, Great Britain, Greece, Guatemala, Guinea, Guinea-Bissau, Gulf of Guinea Is., Guyana, Hainan, Haiti, Honduras, Hungary, Idaho, Illinois, India, Indiana, Iowa, Italy, Ivory Coast, Jamaica, Japan, Jawa, Kansas, Kazakhstan, Kentucky, Kenya, Kirgizstan, Korea, KwaZulu-Natal, Laos, Lebanon-Syria, Leeward Is., Lesotho, Lesser Sunda Is., Liberia, Libya, Louisiana, Madagascar, Maine, Malawi, Malaya, Mali, Manchuria, Manitoba, Maryland, Masachusettes, Mauritania, Mauritius, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Montana, Morocco, Mozambique, Myanmar, Namibia, Nansei-shoto, Nebraska, Nepal, Netherlands, Nevada, New Brunswick, New Guinea, New Hampshire, New Jersey, New Mexico, New South Wales, New York, Nicaragua, Nicobar Is., Niger, Nigeria, North Carolina, North Caucasus, North Dakota, North European Russi, Northern Provinces, Northern Territory, Northwest European R, Nova Scotia, Ohio, Oklahoma, Ontario, Oregon, Pakistan, Palestine, Panamá, Paraguay, Pennsylvania, Peru, Philippines, Poland, Portugal, Primorye, Prince Edward I., Puerto Rico, Queensland, Québec, Rhode I., Romania, Rwanda, Saskatchewan, Senegal, Sierra Leone, South Carolina, South Dakota, South European Russi, Spain, Sri Lanka, Sudan, Sulawesi, Sumatera, Suriname, Swaziland, Sweden, Switzerland, Tadzhikistan, Taiwan, Tanzania, Tennessee, Texas, Thailand, Togo, Transcaucasus, Trinidad-Tobago, Tunisia, Turkey-in-Europe, Turkmenistan, Uganda, Ukraine, Uruguay, Utah, Uzbekistan, Venezuela, Vermont, Vietnam, Virginia, Washington, West Himalaya, West Siberia, West Virginia, Western Australia, Windward Is., Wisconsin, Wyoming, Xinjiang, Yugoslavia, Zambia, Zaïre, Zimbabwe

    Introduced into:

    Galápagos, New Zealand North, Victoria

    Leersia Sw. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Nov 1, 2013 Irwin, H.S. [27334], Brazil K001055022

    First published in Prodr. Veg. Ind. Occ.: 21 (1788)

    Accepted by

    • Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the Trustees of the Royal Botanic Gardens, Kew.

    Literature

    Flora of West Tropical Africa
    • Launert in Senck. Biol. 46: 129 (1965).
    • Prod. Veg. Ind. Occ. 21 (1788), nom. cons.
    Flora Zambesiaca
    • Prodr. Veg. Ind. Occ.: 21 (1788) nom. conserv.
    Flora of Tropical East Africa
    • Launert in Senck. Biol. 46: 129 (1965), nom. conserv.
    • Prod. in Bot. Arch. 1: 211 (1922)
    • Prodr. Veg. Ind. Occ.: 21 (1788)

    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

    Flora of West Tropical Africa
    Flora of West Tropical Africa

    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 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