Poaceae
Dimeria

Dimeria aristata (Hack.) Senaratna

First published in Grass. Ceylon: 163 (1956)
This species is accepted
The native range of this species is Sri Lanka. It is a perennial 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: threatened. Confidence: confident
[AERP]

Morphology General Habit
Perennial. Culms erect, or geniculately ascending; 30-60 cm long. Ligule an eciliate membrane. Leaf-blades 7-15 cm long; 2-4 mm wide. Leaf-blade surface glabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes 2-3; paired, or digitate; sinuous; unilateral; 4-8 cm long. Rhachis angular; ciliate on margins. Spikelet packing crowded; regular; 2 -rowed. Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels cuneate; flattened.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; compressed strongly; 3.5-4 mm long; falling entire. Spikelet callus pubescent; base obtuse.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; compressed strongly; 3.5-4 mm long; falling entire. Spikelet callus pubescent; base obtuse.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume elliptic; 1 length of spikelet; coriaceous; 1-keeled; wingless; 3 -veined. Lower glume primary vein ciliate. Lower glume apex acute. Upper glume elliptic; coriaceous; with hyaline margins; 1-keeled; winged on keel; winged near apex (as a crest), or all along; 3 -veined. Upper glume primary vein ciliate. Upper glume surface glabrous, or pilose. Upper glume apex obtuse.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; hyaline. Fertile lemma elliptic; without keel; 1 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 7-10 mm long overall; with twisted column. Column of lemma awn glabrous. Palea absent or minute.
Morphology Reproductive morphology Flowers
Anthers 2.
Distribution
Asia-tropical: India.
Reference
Andropogoneae. WDC.
[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

    • 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 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

  • 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