Poaceae
Isachne

Isachne clementis Merr.

First published in J. Straits Branch Roy. Asiat. Soc. 76: 76 (1917)
This species is accepted
The native range of this species is W. Malesia. 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; cushion forming. Culms erect; 20-45 cm long; rooting from lower nodes. Lateral branches ample. Leaf-sheaths 1.5-2 cm long; longer than adjacent culm internode; glabrous on surface, or pilose; with tubercle-based hairs; outer margin hairy. Ligule a fringe of hairs. Leaf-blades lanceolate; 2-4 cm long; 4-9 mm wide; stiff. Leaf-blade surface ribbed; glabrous, or pubescent. Leaf-blade margins ciliate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; ovate; 6 cm long; 3 cm wide. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets orbicular; dorsally compressed; 2.4 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite; 0.2 mm long.
Fertile
Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets orbicular; dorsally compressed; 2.4 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite; 0.2 mm long.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes deciduous; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 2.2 mm long; 0.9 length of spikelet; membranous; without keels; 5 -veined. Lower glume surface glabrous, or puberulous; hairy above. Lower glume apex acute. Upper glume ovate; 2.4 mm long; 1.7 length of adjacent fertile lemma; membranous; without keels; 5 -veined. Upper glume surface pubescent. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile florets with the lowest dissimilar. Lowest fertile lemma 1.1-1.2 length of adjacent lemma. Fertile lemma ovate; 1.4 mm long; coriaceous; yellow; without keel. Lemma surface puberulous. Lemma margins involute. Lemma apex obtuse. Palea coriaceous; 2 -veined.
Morphology Reproductive morphology Flowers
Anthers 3; 0.8 mm long; yellow.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; 1 mm long.
Distribution
Asia-tropical: Malesia.
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