Poaceae
Isachne

Isachne confusa Ohwi

First published in Bull. Tokyo Sci. Mus. 18: 14 (1947)
This species is accepted
The native range of this species is SE. China to Indo-China and NW. Pacific. It is a perennial and grows primarily in the wet 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
Perennial; caespitose. Culms geniculately ascending, or decumbent; 10-45 cm long; wiry. Culm-internodes ridged. Lateral branches ample. Leaf-sheaths 0.5-0.8 cm long; pilose; with tubercle-based hairs. Ligule a fringe of hairs, or absent. Leaf-blade base cordate, or amplexicaul. Leaf-blades ovate; 1.5-2.5 cm long; 3-7 mm wide; stiff; glaucous. Leaf-blade margins cartilaginous; ciliate; hairy at base. Leaf-blade apex acute, or acuminate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; comprising 50-70 fertile spikelets. Panicle open; ovate; 2-3 cm long; 2.5 cm wide. Primary panicle branches spreading. Panicle branches stiff; flexuous; secund. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets orbicular; dorsally compressed; 1 mm long; breaking up at maturity; disarticulating below each fertile floret.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets orbicular; dorsally compressed; 1 mm long; breaking up at maturity; disarticulating below each fertile floret.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes deciduous; similar; reaching apex of florets; thinner than fertile lemma. Lower glume oblong; 1 mm long; 1 length of spikelet; membranous; without keels; 5(-7) -veined. Lower glume surface pubescent. Lower glume apex obtuse. Upper glume oblong; 1 mm long; 1 length of adjacent fertile lemma; membranous; without keels; 5(-7) -veined. Upper glume surface pubescent. Upper glume apex obtuse.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets male; with palea; separately deciduous. Lemma of lower sterile floret similar to fertile lemma; ovate; 1 mm long; 1 length of fertile lemma; coriaceous. Fertile florets female. Fertile lemma orbicular; 1 mm long; coriaceous; without keel. Lemma margins involute. Lemma apex obtuse. Palea coriaceous; 2 -veined.
Morphology Reproductive morphology Flowers
Anthers 3; 0.6 mm long; yellow.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
Distribution
Asia-temperate: China. Asia-tropical: Indo-China, Malesia, and Papuasia. Australasia: Australia. Pacific: northwestern.
Reference
Isachneae. Gilliland 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