Family:
Poaceae Barnhart
Genus:
Echinochloa P.Beauv.

Echinochloa oplismenoides (E.Fourn.) Hitchc.

This species is accepted, and its native range is SE. Arizona to Guatemala.

[GB]
Morphology General Habit
Annual; caespitose. Culms 50-100 cm long. Leaf-sheaths glabrous on surface. Ligule absent. Leaf-blades 10-25 cm long; 5-10 mm wide.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes 5-15; borne along a central axis; appressed; unilateral; 2-5 cm long. Central inflorescence axis 10-15 cm long. Rhachis angular. Spikelet packing crowded; irregular; 2-4 -rowed. Spikelets in pairs. Fertile spikelets sessile and pedicelled; subequal. Pedicels oblong.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; plano-convex; acuminate; 4-5 mm long; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; plano-convex; acuminate; 4-5 mm long; falling entire.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 2 mm long; 0.33-0.5 length of spikelet; without keels; 5 -veined. Lower glume surface scabrous. Lower glume apex cuspidate. Upper glume ovate; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface hispid. Upper glume apex cuspidate.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; with palea, or without significant palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; membranous; 5 -veined; hispid; acuminate; awned. Awn of lower sterile floret terminal; 8-16 mm long. Fertile lemma elliptic; gibbous; 4-4.5 mm long; 1.5-1.7 mm wide; indurate; without keel. Lemma margins involute. Lemma apex apiculate. Palea reflexed at apex; indurate.
Morphology Reproductive morphology Flowers
Anthers 3.
Distribution
North America: Mexico.
Reference
Paniceae. Fl Nov Gal 1997.

Native to:

Arizona, Guatemala, Mexico Central, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest

Echinochloa oplismenoides (E.Fourn.) Hitchc. appears in other Kew resources:

First published in Contr. U.S. Natl. Herb. 22: 136 (1920)

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 (2003). Flora of North America North of Mexico 25: 1-781. 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 (2003). Flora of North America North of Mexico 25: 1-781. 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