Poaceae
Triodia

Triodia desertorum (C.E.Hubb.) Lazarides

First published in Austral. Syst. Bot. 10: 429 (1997)
This species is accepted
The native range of this species is S. Central Western Australia. It is a perennial and grows primarily in the desert or dry shrubland biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Culms erect; slender; 40-50 cm long. Culm-internodes distally glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface, or hirsute. Ligule a fringe of hairs. Leaf-blades spreading; aciculate; conduplicate; 4-10 cm long; 2 mm wide; coriaceous; stiff. Leaf-blade surface glabrous. Leaf-blade apex pungent.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; lanceolate; 10-15 cm long. Primary panicle branches bearing 1 fertile spikelets on each lower branch. Panicle axis scaberulous. Panicle branches scaberulous. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 3-5 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 15-18 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus 1.5-1.7 mm long; pubescent; acute.
Fertile
Spikelets comprising 3-5 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 15-18 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus 1.5-1.7 mm long; pubescent; acute.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate, or elliptic; 10-13 mm long; 0.9 length of upper glume; chartaceous; without keels; 9-13 -veined. Lower glume apex entire, or dentate; 3 -fid; acute. Upper glume lanceolate, or elliptic; 11-15 mm long; 2-3 length of adjacent fertile lemma; chartaceous; without keels; 8-9 -veined. Upper glume apex entire, or dentate; 3 -fid; acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong; 4-7 mm long; coriaceous; without keel; 11-13 -veined. Lemma midvein pubescent. Lemma margins pubescent. Lemma apex lobed; 3 -fid; awned; 3 -awned. Principal lemma awn 11-16 mm long overall. Lateral lemma awns arising on apex of lobes; shorter than principal. Palea 5-8 mm long; 2 -veined. Palea surface pubescent; hairy on back. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; fleshy. Anthers 3.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
Distribution
Australasia: Australia.
Reference
Eragrostideae. Fl W Austral 1994.
[GB]

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]

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

  • Herbarium Catalogue Specimens

    • Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. 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

  • World Checklist of Vascular plants (WCVP)

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. 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