1. Family: Poaceae Barnhart
    1. Genus: Nassella (Trin.) É.Desv.
      1. Nassella trichotoma (Nees) Hack. & Arechav.

        This species is accepted, and its native range is S. Brazil to Argentina.

    [GB]
    Habit
    Perennial; caespitose. Culms 30-50 cm long. Ligule an eciliate membrane; obtuse. Leaf-blades filiform; convolute; 15-45 cm long; 0.2-0.5 mm wide; coriaceous.
    Inflorescences
    Inflorescence a panicle; deciduous as a whole. Panicle open; ovate; effuse; 8-20 cm long. Panicle branches capillary. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 4-8.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; pilose; acute. Floret callus hairs 0.5 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 4-8.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; pilose; acute. Floret callus hairs 0.5 length of lemma.
    Glume
    Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 4-8.5 mm long; 1 length of upper glume; hyaline; without keels; 3 -veined. Lower glume surface scabrous. Lower glume apex attenuate. Upper glume lanceolate; 4-8.5 mm long; 2.5-3.5 length of adjacent fertile lemma; hyaline; without keels; 3 -veined. Upper glume surface scabrous; rough on veins. Upper glume apex attenuate.
    Florets
    Fertile lemma oblate; laterally compressed; 1.5-2.5 mm long; coriaceous; keeled; lightly keeled. Lemma surface tuberculate. Lemma margins convolute; covering most of palea. Lemma apex truncate; surmounted by a ring of hairs (obscure); awned; 1 -awned. Principal lemma awn eccentric; geniculate; 15-32 mm long overall; with twisted column; persistent, or deciduous. Column of lemma awn glabrous. Palea 0.5 length of lemma; hyaline; 0 -veined; without keels.
    Flowers
    Anthers 3; 1-1.5 mm long.
    Fruits
    Caryopsis with adherent pericarp; oblong; 1.2 mm long; dark brown.
    Distribution
    Europe: southwestern and southeastern. Africa: Macaronesia and south. Australasia: Australia and New Zealand. South America: Brazil and southern South America.
    Reference
    Stipeae. WDC.

    Distribution

    Native to:

    Argentina Northeast, Argentina Northwest, Argentina South, Brazil South, Uruguay

    Introduced into:

    Cape Provinces, France, Great Britain, Illinois, Italy, Kentucky, Madeira, New South Wales, New Zealand North, New Zealand South, North Carolina, South Australia, South Carolina, Tasmania, Victoria

    Nassella trichotoma (Nees) Hack. & Arechav. appears in other Kew resources:

    First published in Anales Mus. Nac. Montevideo 1: 336 (1896)

    Accepted by

    • Parslow, R. & Bennallick, I. (2017). The new flora of the Isles of Scilly: 1-539. Parslow Press.
    • Sclovich, S.E., Giussani, L.M., Ciadella, A.M. & Sede, S.M. (2015). Phylogenetic analysis of Jarava (Poaceae, Pooideae, Stipeae) and related genera: testing the value of the awn indumendum in the circumscription of Jarava Plant Systematics and Evolution 301: 1625-1641.
    • Cialdella, A.M., Muñoz-Schick, M. & Morrone, O. (2013). Sinopsis de las especies Austro-Americanas del género Nassella (Poaceae, Pooideae, Stipeae) Darwiniana, n.s., 1: 76-161.
    • Edgar, E & Connor, H.E. (2010). Flora of New Zealand, ed. 2, 5: 1-650. R.E.Owen, Government Printer, Wellington.
    • Dobignard, D. & Chatelain, C. (2010). Index synonymique de la flore d'Afrique du nord 1: 1-455. Éditions des conservatoire et jardin botaniques, Genève.
    • Wilson, A. (ed.) (2009). Flora of Australia 44A: 1-410. Australian Government Publishing Service, Canberra.
    • Zuloaga, F.O., Morrone, O. , Belgrano, M.J., Marticorena, C. & Marchesi, E. (eds.) (2008). Catálogo de las Plantas Vasculares del Cono Sur Monographs in Systematic Botany from the Missouri Botanical Garden 107: 1-3348.
    • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.
    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Germishuizen, G. & Meyer, N.L. (eds.) (2003). Plants of Southern Africa: an annotated checklist. Strelitzia 14.: i-vi, 1-1231. National Botanical Institute, Pretoria.

    Literature

    Kew Backbone Distributions
    • Parslow, R. & Bennallick, I. (2017). The new flora of the Isles of Scilly: 1-539. Parslow Press.
    • Edgar, E & Connor, H.E. (2010). Flora of New Zealand, ed. 2, 5: 1-650. R.E.Owen, Government Printer, Wellington.
    • Dobignard, D. & Chatelain, C. (2010). Index synonymique de la flore d'Afrique du nord 1: 1-455. Éditions des conservatoire et jardin botaniques, Genève.
    • Wilson, A. (ed.) (2009). Flora of Australia 44A: 1-410. Australian Government Publishing Service, Canberra.
    • Zuloaga, F.O., Morrone, O. , Belgrano, M.J., Marticorena, C. & Marchesi, E. (eds.) (2008). Catálogo de las Plantas Vasculares del Cono Sur Monographs in Systematic Botany from the Missouri Botanical Garden 107: 1-3348.
    • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.
    • Germishuizen, G. & Meyer, N.L. (eds.) (2003). Plants of Southern Africa: an annotated checklist. Strelitzia 14.: i-vi, 1-1231. National Botanical Institute, Pretoria.
    • Tutin, T.G. & al. (eds.) (1980). Flora Europaea 5: 1-452. Cambridge University Press.

    Sources

    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