Poaceae
Dimeria

Dimeria stapfiana C.E.Hubb. ex Pilg.

First published in H.G.A.Engler, Nat. Pflanzenfam., ed. 2. 14e: 109 (1940)
This species is accepted
The native range of this species is W. India. 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: threatened. Confidence: confident
[AERP]

Morphology General Habit
Annual. Culms erect; slender; 20-45 cm long. Culm-nodes bearded. Lateral branches sparse. Leaf-sheaths pilose; with tubercle-based hairs. Ligule a ciliolate membrane; 1 mm long. Leaf-blades 3-7 cm long; 2-5 mm wide. Leaf-blade surface scabrous; rough on both sides; pilose; hairy on both sides; with tubercle-based hairs. Leaf-blade margins scabrous; tuberculate-ciliate. Leaf-blade apex acute.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes 4-7; digitate; unilateral; 5-10 cm long. Rhachis subterete; glabrous on margins. Spikelet packing lax; regular; 2 -rowed. Spikelets spreading; solitary. Fertile spikelets pedicelled. Pedicels clavate; flattened; 0.5-2 mm long; glabrous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; compressed strongly; 4-7 mm long; falling entire. Spikelet callus oblong; 0.5 mm long; bearded; base obtuse.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; compressed strongly; 4-7 mm long; falling entire. Spikelet callus oblong; 0.5 mm long; bearded; base obtuse.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume oblong; 4-6 mm long; 0.8 length of spikelet; coriaceous; much thinner on margins; 1-keeled. Lower glume surface pubescent. Lower glume apex obtuse. Upper glume elliptic; 1 length of spikelet; coriaceous; with hyaline margins; 1-keeled; winged on keel; winged above. Upper glume surface pilose; hairy at apex. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 2 mm long; hyaline; ciliate on margins. Fertile lemma elliptic; 3 mm long; hyaline; without keel; 1 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 14 mm long overall; with twisted column. Column of lemma awn 5 mm long; glabrous. Palea absent or minute.
Morphology Reproductive morphology Flowers
Anthers 2; 2.5-3 mm long.
Distribution
Asia-tropical: India.
Reference
Andropogoneae. Bor 1993.
Diagnostic
Glume wing corky.
[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