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This species is accepted, and its native range is Bolivia to N. Argentina.
A specimen from Kew's Herbarium

[GB]
Morphology General Habit
Annual, or perennial; short-lived. Culms erect, or geniculately ascending; robust; 40-140 cm long; without nodal roots, or rooting from lower nodes. Leaves cauline. Leaf-sheaths loose, or inflated; glabrous on surface. Ligule a fringe of hairs; 1.5-3.5 mm long. Leaf-blade base simple, or broadly rounded, or cordate. Leaf-blades 15-30 cm long; 5-20 mm wide. Leaf-blade surface pilose; sparsely hairy. Leaf-blade margins scabrous. Leaf-blade apex acuminate.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes 5-13; borne along a central axis; unilateral; 2-5 cm long; simple. Central inflorescence axis 5-20 cm long. Rhachis narrowly winged; angular; 0.5-0.7 mm wide; scabrous on margins. Spikelet packing irregular; 4 -rowed. Spikelets in pairs. Fertile spikelets sessile.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; gibbous; cuspidate; 3.5-5 mm long; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; gibbous; cuspidate; 3.5-5 mm long; falling entire.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; clasping; 0.3-0.4 length of spikelet; membranous; without keels; 5 -veined. Lower glume apex acute. Upper glume ovate; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface hispidulous. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; membranous; 3-5 -veined; hispidulous; acuminate. Fertile lemma orbicular; gibbous; 3-4.5 mm long; indurate; much thinner above; shiny; without keel. Lemma surface smooth, or striate. Lemma margins involute. Lemma apex apiculate. Palea reflexed at apex; indurate.
Morphology Reproductive morphology Flowers
Anthers 3.
Distribution
South America: western South America.
Reference
Paniceae. Renvoize 1996.

Native to:

Argentina Northeast, Argentina Northwest, Bolivia

Echinochloa chacoensis Michael ex Renvoize appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Aug 13, 1982 Renvoize, S.A. [3906], Bolivia K000309364 holotype

First published in Kurtziana 24: 1161 (1995)

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.
  • Renvoize, S.A. (1998). Gramineas de Bolivia: 1-644. 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

  • Renvoize, S.A. (1998). Gramineas de Bolivia: 1-644. 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.

GrassBase - The Online World Grass Flora
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens
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 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