Family:
Poaceae Barnhart
Genus:
Echinochloa P.Beauv.

Echinochloa lacunaria (F.Muell.) Michael & Vickery

This species is accepted, and its native range is SE. South Australia to W. New South Wales.

[GB]
Morphology General Habit
Annual. Butt sheaths papery. Culms erect; slender; 45-90 cm long; 4 -noded. Culm-internodes ridged; smooth. Culm-nodes glabrous. Leaf-sheaths loose; keeled; smooth; glabrous on surface. Ligule absent. Leaf-blades 10-25 cm long; 5-7 mm wide. Leaf-blade venation with 6 secondary veins. Leaf-blade surface smooth; glabrous. Leaf-blade margins cartilaginous; smooth. Leaf-blade apex acuminate.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes few; borne along a central axis; erect; unilateral; 2-6 cm long; simple, or with branchlets at base of longer racemes. Rhachis narrowly winged; angular; smooth on margins. Spikelet packing lax; 4 -rowed. Raceme-bases glabrous. Spikelets in pairs. Fertile spikelets pedicelled; subequal. Pedicels unequal; glabrous; tip discoid.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or ovate; dorsally compressed; turgidly plano-convex; acute; 4.75-6 mm long; 2 mm wide; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or ovate; dorsally compressed; turgidly plano-convex; acute; 4.75-6 mm long; 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; 0.33-0.5 length of spikelet; without keels; 3-5 -veined. Lower glume surface smooth, or asperulous. Lower glume apex acute, or acuminate. Upper glume elliptic; gibbous; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface asperulous; rough above. Upper glume apex acuminate, or cuspidate.
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; 5-7 -veined; concave across back; scaberulous; rough above; acuminate, or cuspidate. Fertile lemma elliptic, or ovate; gibbous; 4 mm long; 2 mm wide; indurate; much thinner above; yellow; shiny; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface smooth. Lemma margins involute. Lemma apex cuspidate. Palea reflexed at apex; 1 length of lemma; indurate.
Morphology Reproductive morphology Flowers
Anthers 3; 1.1-1.3 mm long; brown.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; ellipsoid, or oblong; 2.2-2.3 mm long. Embryo 0.75 length of caryopsis.
Distribution
Australasia: Australia.
Reference
Paniceae. Fl NSW 1997.

Native to:

New South Wales, South Australia

Echinochloa lacunaria (F.Muell.) Michael & Vickery appears in other Kew resources:

Date Reference Identified As Barcode Type Status Has image?
Jan 17, 1973 Mueller, F. [s.n.], South Australia K000215134 Yes

First published in Telopea 1: 44 (1975)

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.

  • 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 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