Poaceae
Digitaria

Digitaria gibbosa (R.Br.) P.Beauv.

First published in Ess. Agrostogr.: 160 (1812)
This species is accepted
The native range of this species is N. Australia. It is an annual and grows primarily in the seasonally dry tropical 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
Annual. Culms erect; 25-40 cm long; 2-5 -noded. Culm-nodes glabrous. Leaf-sheaths without keel; antrorsely scabrous; glabrous on surface, or pubescent; outer margin glabrous. Leaf-sheath auricles erect. Ligule a ciliolate membrane; 0.3-1 mm long. Leaf-blades linear, or lanceolate; 2.5-15 cm long; 1-4 mm wide. Leaf-blade surface scabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes 1; single; unilateral; 4-18 cm long; simple, or secondarily branched. Rhachis wingless; angular; 0.35-0.45 mm wide; smooth on margins, or scaberulous on margins. Spikelets in pairs, or clustered at each node. Fertile spikelets pedicelled; 2-10(-25) in the cluster. Pedicels unequal; 0.5-1.5 mm long; ciliate; tip discoid.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 1.5-2.8 mm long; 0.6-1.2 mm wide; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 1.5-2.8 mm long; 0.6-1.2 mm wide; falling entire.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes one the lower absent or obscure; shorter than spikelet; thinner than fertile lemma. Upper glume lanceolate; 1.2-2.2 mm long; 0.6-0.95 length of spikelet; membranous; without keels; 3 -veined. Upper glume surface villous. Upper glume apex acute, or acuminate.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate, or elliptic; 1 length of spikelet; membranous; 5-7 -veined; pubescent; hairy between veins, or between veins but central interspaces glabrous; acute, or acuminate. Fertile lemma lanceolate; 1.5-2.8 mm long; cartilaginous; much thinner on margins; keeled. Lemma surface striate. Lemma margins flat; covering most of palea. Lemma apex acute, or acuminate; mucronate. Palea cartilaginous.
Distribution
Australasia: Australia.
Reference
Paniceae. Webster 1993.
[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

  • Herbarium Catalogue Specimens

    • 'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    • 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 Vascular Plants 2025. 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 2025. 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