1. Family: Poaceae Barnhart
    1. Genus: Hilaria Kunth
      1. Hilaria annua Reeder & C.Reeder

        This species is accepted, and its native range is Mexico (Colima).

    [GB]
    Habit
    Annual; caespitose. Culms erect, or geniculately ascending; slender; 40-50(-60) cm long; rooting from lower nodes. Culm-nodes bearded. Lateral branches ample. Ligule a ciliolate membrane; 2-3 mm long. Leaf-blades 10-20(-30) cm long; 3.5-5 mm wide. Leaf-blade surface glabrous, or pilose; hairy adaxially; with tubercle-based hairs. Leaf-blade margins scabrous.
    Inflorescences
    Inflorescence composed of racemes. Racemes borne along a central axis; closely spaced; in a multilateral false spike; cuneate; unilateral; 0.3-0.5 cm long; bearing a triad of spikelets. Central inflorescence axis (3.5-)4-5 cm long; flattened; puberulous. Rhachis obsolete; deciduous from axis. Spikelets in threes. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets sessile; 2 in the cluster.
    Spikelets
    Companion sterile spikelets well-developed; male; oblong; asymmetrical; dorsally compressed; 3.5-4.5 mm long; as long as fertile; deciduous with the fertile. Companion sterile spikelet glumes united below; coriaceous; 7 -veined; scabrous; ciliolate on margins; muticous. Companion sterile spikelet lemmas 1(-3); exserted from glumes; muticous. Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 3.5-4.5 mm long; falling entire; deciduous with accessory branch structures.
    Sterile
    Companion sterile spikelets well-developed; male; oblong; asymmetrical; dorsally compressed; 3.5-4.5 mm long; as long as fertile; deciduous with the fertile. Companion sterile spikelet glumes united below; coriaceous; 7 -veined; scabrous; ciliolate on margins; muticous. Companion sterile spikelet lemmas 1(-3); exserted from glumes; muticous.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 3.5-4.5 mm long; falling entire; deciduous with accessory branch structures.
    Glume
    Glumes connate along margins below; shorter than spikelet. Lower glume oblong; asymmetrical; 3.5-4.5 mm long; 1 length of upper glume; coriaceous; pallid; 1-keeled; 7 -veined. Lower glume surface scabrous. Lower glume margins ciliolate. Lower glume apex lobed; 2 -fid; awned; 1 -awned. Lower glume awn 1 mm long. Upper glume oblong; asymmetrical; 3.5-4.5 mm long; 1 length of adjacent fertile lemma; coriaceous; pallid; 1-keeled; 7 -veined. Upper glume surface scabrous. Upper glume margins ciliolate. Upper glume apex lobed; 2 -fid; awned; 1 -awned. Upper glume awn 1 mm long.
    Florets
    Fertile florets female. Fertile lemma ovate; laterally compressed; 3.5-4.5 mm long; cartilaginous; keeled; 3 -veined. Lemma apex caudate.
    Flowers
    Anthers 3; 2 mm long.
    Fruits
    Caryopsis 1.8-2 mm long. Embryo 1 length of caryopsis.
    Distribution
    North America: Mexico.
    Reference
    Cynodonteae. Reeder.

    Images

    Distribution

    Native to:

    Mexico Southwest

    Hilaria annua Reeder & C.Reeder appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Reeder [6331], Mexico K000309086 paratype

    First published in Madroño 35: 7 (1988)

    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.
    • 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.

    Literature

    Kew Backbone Distributions
    • 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

    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