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This species is accepted, and its native range is S. Brazil to NE. Argentina.

[GB]
Morphology General Habit
Perennial. Rhizomes elongated. Culms decumbent; 30-130 cm long; 3-4 mm diam. Culm-nodes pubescent. Leaf-sheaths glabrous on surface. Ligule a fringe of hairs; 1-4 mm long. Leaf-blades 7.5-30 cm long; 5-12 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes 5-10; borne along a central axis; appressed; unilateral; 2-4 cm long. Central inflorescence axis 6-20 cm long. Rhachis subterete; scabrous on margins. Spikelet packing 4 -rowed. Spikelets in pairs. Fertile spikelets pedicelled; subequal. Pedicels unequal; 1-6 mm long; tip discoid.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; cuspidate; 6-7 mm long; 1.7-2.2 mm wide; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; cuspidate; 6-7 mm long; 1.7-2.2 mm wide; falling entire.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; clasping; 4.5-5 mm long; 0.75 length of spikelet; without keels; 7 -veined. Lower glume surface scabrous; rough on veins. Lower glume apex cuspidate. Upper glume elliptic; 1 length of spikelet; membranous; without keels; 9 -veined. Upper glume surface hispidulous. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 2-5 mm long.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets male; with palea. Lemma of lower sterile floret similar to upper glume; elliptic; 1 length of spikelet; membranous; 9 -veined; hispidulous; acuminate; awned. Awn of lower sterile floret 5-15 mm long. Fertile lemma ovate; 5-5.8 mm long; indurate; much thinner above; shiny; without keel. Lemma margins involute. Lemma apex rostrate; laterally pinched. Palea reflexed at apex; indurate.
Morphology Reproductive morphology Flowers
Anthers 3; 3.5-4 mm long; red.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
Distribution
South America: southern South America.
Reference
Paniceae. Fl Entrerios 1994.

Native to:

Argentina Northeast, Brazil South, Paraguay, Uruguay

Echinochloa helodes (Hack.) Parodi appears in other Kew resources:

First published in Physis (Buenos Aires) 8: 72 (1925)

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.
  • Zuloaga, F.O., Morrone, O. , Belgrano, M.J., Marticorena, C. & Marchesi, E. (eds.) (2008). Catálogo de las Plantas Vasculares del Cono Sur Monographs in Systematic Botany from the Missouri Botanical Garden 107: 1-3348. Missouri Botanical Garden.

Literature

Kew Backbone Distributions

  • Forzza, R.C. & al. (2013). Lista de Espécies da Flora do Brasil http://floradobrasil.jbrj.gov.br/2010/.
  • Zuloaga, F.O., Morrone, O. , Belgrano, M.J., Marticorena, C. & Marchesi, E. (eds.) (2008). Catálogo de las Plantas Vasculares del Cono Sur Monographs in Systematic Botany from the Missouri Botanical Garden 107: 1-3348. Missouri Botanical Garden.

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 2021. 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 2021. 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