Genus:
Hordeum L.

Hordeum arizonicum Covas

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

[GB]
Morphology General Habit
Annual. Culms 20-60 cm long. Leaf-sheaths pubescent. Leaf-sheath oral hairs lacking. Leaf-sheath auricles falcate. Ligule an eciliate membrane. Leaf-blades 3-5 mm wide. Leaf-blade surface pubescent; sparsely hairy.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes 1; single; bilateral; 3-12 cm long. Rhachis fragile at the nodes; flattened. Spikelet packing broadside to rhachis. Rhachis internodes oblong; falling with spikelet above. Spikelets in threes. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 2 in the cluster. Pedicels oblong.
Morphology Reproductive morphology Inflorescences Spikelets
Companion sterile spikelets well-developed; containing empty lemmas; lanceolate; dorsally compressed; shorter than fertile; deciduous with the fertile. Companion sterile spikelet glumes subulate. Companion sterile spikelet lemmas 1; exserted from glumes; 1-awned. Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 8-9 mm long; falling entire; deciduous with accessory branch structures.
Sterile
Companion sterile spikelets well-developed; containing empty lemmas; lanceolate; dorsally compressed; shorter than fertile; deciduous with the fertile. Companion sterile spikelet glumes subulate. Companion sterile spikelet lemmas 1; exserted from glumes; 1-awned.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 8-9 mm long; falling entire; deciduous with accessory branch structures.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes collateral; similar; exceeding apex of florets; gaping. Lower glume subulate; 15-20 mm long; 1 length of upper glume. Upper glume subulate; 15-20 mm long.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; 8-9 mm long; coriaceous; without keel; 5 -veined. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn 15-22 mm long overall.
Morphology Reproductive morphology Flowers
Anthers 3. Ovary pubescent on apex.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; hairy at apex. Hilum linear.
Distribution
North America: southwest USA and Mexico.
Reference
Triticeae. Gr Baja Cal 1994.

Native to:

Arizona, California, Mexico Northeast, Mexico Northwest, New Mexico

Hordeum arizonicum Covas appears in other Kew resources:

First published in Madroño 10: 16 (1949)

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.
  • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.

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.
  • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.

  • 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 2022. 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 2022. 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