Poaceae
Dimeria

Dimeria paniculata Masam.

First published in Trans. Nat. Hist. Soc. Formosa 28: 149 (1938)
This species is accepted
The native range of this species is Caroline Islands (Palau). It is an annual and grows primarily in the wet tropical biome.

Descriptions

Morphology General Habit
Annual. Culms erect; slender; 24 cm long. Leaf-sheaths 1.5-4.5 cm long; as wide as blade at the collar; glabrous on surface. Leaf-sheath oral hairs scanty, or ciliate. Ligule a ciliolate membrane; 0.5 mm long; truncate. Leaf-blades 4-5 cm long; 2.5 mm wide. Leaf-blade surface glabrous. Leaf-blade apex attenuate.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes (3-)4; digitate; unilateral; 5-7 cm long. Rhachis flattened; ciliate on margins. Spikelet packing crowded; regular; 2 -rowed. Rhachis internodes 0.5-1.5 mm long. Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels reduced to a stump; flattened; pubescent.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; compressed strongly; 2 mm long; falling entire. Spikelet callus base obtuse.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; compressed strongly; 2 mm long; falling entire. Spikelet callus base obtuse.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes dissimilar; with lower narrower than upper; exceeding apex of florets; firmer than fertile lemma. Lower glume linear; 2 mm long; 1 length of spikelet; chartaceous; 1-keeled. Lower glume apex acute. Upper glume lanceolate; 1 length of spikelet; chartaceous, or coriaceous; 1-keeled; wingless. Upper glume primary vein ciliolate. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 1.5 mm long; hyaline. Fertile lemma lanceolate; 1.8 mm long; hyaline; without keel; 1 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 5.5 mm long overall; with twisted column. Palea absent or minute.
Distribution
Pacific: northwestern.
Reference
Andropogoneae. Hosokawa 2007.
[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: threatened. Confidence: low confidence
[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

  • 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