1. Family: Poaceae Barnhart
    1. Genus: Nassella (Trin.) É.Desv.
      1. Nassella cernua (Stebbins & Love) Barkworth

        This species is accepted, and its native range is California to NW. Mexico.

    [GB]
    Habit
    Perennial; caespitose; clumped densely. Culms erect; 60-90 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 2 mm long. Leaf-blades flat, or involute; 1.2-2.4 mm wide; glaucous. Leaf-blade surface pilose; hairy adaxially, or on both sides.
    Inflorescences
    Inflorescence a panicle; exserted, or embraced at base by subtending leaf. Panicle open; linear; 30-50 cm long. Primary panicle branches ascending, or spreading. Panicle branches flexuous. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 12-19 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 2 mm long; pubescent; pungent.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 12-19 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 2 mm long; pubescent; pungent.
    Glume
    Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume linear, or lanceolate; 12-19 mm long; 1.1-1.7 length of upper glume; membranous; without keels; 3 -veined. Lower glume apex acuminate. Upper glume linear, or lanceolate; 11 mm long; 1.1-2 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume apex acuminate.
    Florets
    Fertile lemma elliptic; subterete; 5-10 mm long; chartaceous; without keel. Lemma surface papillose; pilose; hairy below. Lemma margins convolute; covering most of palea. Lemma apex awned; 1 -awned. Principal lemma awn bigeniculate; 60-110 mm long overall; with twisted column. Column of lemma awn glabrous, or hispidulous. Palea ovate; 1-1.5 mm long; 0 -veined; without keels. Palea apex obtuse.
    Flowers
    Anthers 3. Stigmas 2.
    Fruits
    Caryopsis with adherent pericarp; trigonous; 4 mm long; light brown. Hilum linear.
    Distribution
    Pacific: north-central. North America: southwest USA and Mexico.
    Reference
    Stipeae. Wagner 1993.

    Distribution

    Native to:

    California, Mexico Northwest

    Introduced into:

    Hawaii

    Nassella cernua (Stebbins & Love) Barkworth appears in other Kew resources:

    First published in Taxon 39: 609 (1990)

    Accepted by

    • Dávila, P., Mejia-Saulés, M.T., Gómez-Sánchez, N., Valdés-Reyna, J., Ortíz, J.J., Morín, C., Castrejón, J. & Ocampo, A. (2006). Catálogo de las Gramíneas de México: 1-671. CONABIO, México city.

    Not accepted by

    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew. [Cited as Stipa cernua.]

    Literature

    Kew Backbone Distributions
    • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.
    • Dávila, P., Mejia-Saulés, M.T., Gómez-Sánchez, N., Valdés-Reyna, J., Ortíz, J.J., Morín, C., Castrejón, J. & Ocampo, A. (2006). Catálogo de las Gramíneas de México: 1-671. CONABIO, México city.

    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