1. Family: Poaceae Barnhart
    1. Genus: Hilaria Kunth
      1. Hilaria jamesii (Torr.) Benth.

        This species is accepted, and its native range is W. & Central U.S.A.

    [GB]
    Habit
    Perennial; caespitose. Rhizomes short. Culms erect; 20-65 cm long. Culm-internodes distally glabrous. Culm-nodes pubescent. Leaf-sheaths smooth, or scaberulous. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 2-3 mm long; lacerate. Leaf-blades involute; 2-20 cm long; 2-4 mm wide; stiff. Leaf-blade surface ribbed; scabrous; rough on both sides.
    Inflorescences
    Inflorescence composed of racemes. Racemes numerous; borne along a central axis; closely spaced; in a multilateral false spike; oblong; unilateral; 0.6-0.8 cm long; bearing a triad of spikelets. Central inflorescence axis 2-6 cm long; pubescent. Rhachis obsolete; deciduous from axis. Raceme-bases brief; pilose. Spikelets in threes. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 2 in the cluster.
    Spikelets
    Companion sterile spikelets well-developed; male; oblong; asymmetrical; dorsally compressed; 5-7 mm long; shorter than fertile; deciduous with the fertile. Companion sterile spikelet glumes free; membranous; 3-7 -veined; ciliolate on margins; lobed; 2 -fid; awned; one glume awned; with 6-8 mm long awn. Companion sterile spikelet lemmas 3; exserted from glumes; 5-7 mm long; muticous. Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 6-8 mm long; falling entire; deciduous with accessory branch structures.
    Sterile
    Companion sterile spikelets well-developed; male; oblong; asymmetrical; dorsally compressed; 5-7 mm long; shorter than fertile; deciduous with the fertile. Companion sterile spikelet glumes free; membranous; 3-7 -veined; ciliolate on margins; lobed; 2 -fid; awned; one glume awned; with 6-8 mm long awn. Companion sterile spikelet lemmas 3; exserted from glumes; 5-7 mm long; muticous.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 6-8 mm long; falling entire; deciduous with accessory branch structures.
    Glume
    Glumes free; shorter than spikelet. Lower glume lanceolate; asymmetrical; chartaceous; pallid; 1-keeled; 7 -veined. Lower glume primary vein ciliate. Lower glume surface pubescent. Lower glume margins ciliate. Lower glume apex lobed; 5 -fid; awned; 7 -awned. Lower glume awn 3-5 mm long. Upper glume lanceolate; asymmetrical; 0.75 length of adjacent fertile lemma; chartaceous; pallid; 1-keeled; 7 -veined. Upper glume primary vein ciliate. Upper glume surface puberulous. Upper glume margins ciliate. Upper glume apex lobed; 5 -fid; awned; 7 -awned. Upper glume awn 3-5 mm long.
    Florets
    Fertile florets bisexual. Fertile lemma lanceolate; laterally compressed; 6-8 mm long; cartilaginous; keeled; 3 -veined. Lemma apex dentate; 2 -fid; obtuse; awned; 1 -awned. Principal lemma awn from a sinus; 2-3 mm long overall.
    Flowers
    Lodicules 2; 0.1-0.2 mm long. Anthers 3; 3 mm long.
    Distribution
    North America: northwest USA, southwest USA, and south-central USA.
    Reference
    Cynodonteae. Swallen.

    Images

    Distribution

    Native to:

    Arizona, California, Colorado, Kansas, Nevada, New Mexico, Oklahoma, Texas, Utah, Wyoming

    Hilaria jamesii (Torr.) Benth. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Nuttall, T. [s.n.], USA K000674283

    First published in J. Linn. Soc., Bot. 19: 62 (1881)

    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.
    • Flora of North America Editorial Committee (2003). Flora of North America North of Mexico 25: 1-781. Oxford University Press, New York, Oxford.

    Literature

    Kew Backbone Distributions
    • Flora of North America Editorial Committee (2003). Flora of North America North of Mexico 25: 1-781. Oxford University Press, New York, Oxford.

    Sources

    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