Poaceae
Leersia

Leersia japonica (Honda) Honda

First published in J. Fac. Sci. Univ. Tokyo, Sect. 3, Bot. 3: 7 (1930)
This species is accepted
The native range of this species is China to Temp. E. Asia. It is a perennial and grows primarily in the temperate 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
Perennial. Rhizomes elongated. Culms prostrate; 100-120 cm long; rooting from lower nodes. Culm-nodes bearded. Leaf-sheaths smooth, or scaberulous. Leaf-sheath auricles erect. Ligule an eciliate membrane; 1-2.5 mm long; truncate. Leaf-blades 6-12 cm long; 5-7 mm wide. Leaf-blade surface scaberulous. Leaf-blade margins scabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; ovate; 8-11 cm long. Primary panicle branches 4-14 in number; ascending; 1 -nate; 5-8 cm long; bearing spikelets almost to the base. Panicle branches flat (1mm wide). Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; compressed strongly; acuminate; 5-6 mm long; falling entire.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; compressed strongly; acuminate; 5-6 mm long; falling entire.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes both absent or obscure.
Morphology Reproductive morphology Flowers Florets
Fertile lemma 5-6 mm long; chartaceous; keeled; 5 -veined. Lemma midvein ciliate. Lemma surface glabrous. Lemma margins involute. Lemma hairs 0.5 mm long. Palea 1 length of lemma; chartaceous; 3 -veined; 1-keeled. Palea keels ciliate.
Morphology Reproductive morphology Flowers
Lodicules 2. Anthers 6; 3 mm long. Stigmas 2.
Distribution
Asia-temperate: China and eastern Asia.
Reference
Oryzeae. Pyrah.
[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 2026. 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 2026. 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