Poaceae
Isachne

Isachne brassii Hitchc.

First published in Proc. Linn. Soc. New South Wales 54: 146 (1929)
This species is accepted
The native range of this species is Sulawesi to New Guinea. It is a perennial and grows primarily in the wet tropical biome.

Descriptions

Morphology General Habit
Perennial. Culms decumbent; weak; 8-50 cm long; rooting from lower nodes. Culm-internodes distally glabrous. Lateral branches sparse. Leaf-sheaths glabrous on surface to pubescent; outer margin hairy. Ligule a fringe of hairs; 1-2 mm long. Leaf-blades lanceolate, or oblong; 1.5-7 cm long; 3-8 mm wide. Leaf-blade surface scabrous; rough on both sides; glabrous, or pilose; sparsely hairy.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; elliptic; 3-10 cm long; contracted about primary branches. Primary panicle branches ascending. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets orbicular; tilted on the pedicel; dorsally compressed; 1.5-1.7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes flattened.
Fertile
Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets orbicular; tilted on the pedicel; dorsally compressed; 1.5-1.7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes flattened.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes deciduous; similar; reaching apex of florets; thinner than fertile lemma. Lower glume obovate; 1.5-1.7 mm long; 1 length of upper glume; 1 length of spikelet; membranous; without keels. Lower glume surface glabrous, or hispidulous. Lower glume apex obtuse. Upper glume obovate; 1.5-1.7 mm long; 1 length of adjacent fertile lemma; membranous; without keels. Upper glume surface glabrous, or hispidulous. Upper glume apex obtuse.
Morphology Reproductive morphology Flowers Florets
Fertile florets with the lowest dissimilar. Lowest fertile lemma 1.05 length of adjacent lemma; thinner than adjacent lemma (slightly). Fertile lemma elliptic, or orbicular; 1.5-1.7 mm long; coriaceous; shiny; without keel. Lemma surface glabrous. Lemma margins involute. Lemma apex obtuse. Palea coriaceous; 2 -veined.
Distribution
Asia-tropical: Malesia and Papuasia.
Reference
Isachneae. Reeder 1997.
[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: not threatened. Confidence: confident
[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

  • 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