Poaceae
Eragrostis

Eragrostis triquetra Lazarides

First published in Austral. Syst. Bot. 10: 162 (1997)
This species is accepted
The native range of this species is Queensland. It is a perennial and grows primarily in the desert or dry shrubland biome.

Descriptions

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: not threatened. Confidence: confident
[AERP]

Morphology General Habit
Perennial; caespitose. Cataphylls evident. Butt sheaths glossy; pubescent. Culms slender; 16-30 cm long; 2-4 -noded. Culm-internodes eglandular. Lateral branches lacking, or sparse. Leaf-sheaths tight; mostly shorter than adjacent culm internode; wider than blade at the collar; eglandular; scaberulous; outer margin hairy. Leaf-sheath oral hairs bearded. Ligule a fringe of hairs; 0.3-0.5 mm long. Collar glabrous, or bearded. Leaf-blades curved, or flexuous; filiform; convolute; 1-1.5 mm wide. Leaf-blade venation prominent. Leaf-blade surface scabrous; rough adaxially; pilose; hairy on both sides; with tubercle-based hairs. Leaf-blade margins cartilaginous; eglandular; scabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Peduncle eglandular. Panicle contracted; elliptic; 6-10 cm long; 3-4.5 cm wide. Primary panicle branches 1-2 cm long; bearing spikelets almost to the base. Panicle axis eglandular. Panicle branches eglandular; scabrous; glabrous in axils, or pubescent in axils. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.3-1.5 mm long; eglandular.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 22-31 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed, or subterete; 5-13.5 mm long; 1-1.3 mm wide; breaking up at maturity; rhachilla persistent; retaining paleas. Rhachilla internodes zig-zag; 0.5 mm long; eventually visible between lemmas.
Fertile
Spikelets comprising 22-31 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed, or subterete; 5-13.5 mm long; 1-1.3 mm wide; breaking up at maturity; rhachilla persistent; retaining paleas. Rhachilla internodes zig-zag; 0.5 mm long; eventually visible between lemmas.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes deciduous; similar; shorter than spikelet. Lower glume lanceolate, or ovate; 1-1.3 mm long; 1 length of upper glume; membranous; without keels, or 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex emarginate, or obtuse to acuminate. Upper glume lanceolate, or ovate; 1-1.3 mm long; 0.75-1 length of adjacent fertile lemma; membranous; without keels, or 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex emarginate, or obtuse to acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; 1-1.8 mm long; membranous, or cartilaginous; keeled; 3 -veined. Lemma lateral veins obscure, or distinct. Lemma surface smooth, or scaberulous. Lemma apex emarginate, or obtuse; muticous, or mucronate. Palea obovate, or oblanceolate; with flaps narrower than body; bowed outwards; membranous, or cartilaginous; 2 -veined. Palea keels adorned above. Palea apex obtuse; scaberulous. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Anthers 2, or 3; 0.1-0.2 mm long; retained within floret, or eventually exserted.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; oblong, or ovoid; trigonous (curved); stipitate; 0.3-0.6 mm long.
Distribution
Australasia: Australia.
Reference
Eragrostideae. Lazarides 1997.
[GB]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0

  • GrassBase - The Online World Grass Flora

    • Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). 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 Vascular Plants 2026. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2026. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0