Poaceae
Isachne

Isachne leersioides Griseb.

First published in Pl. Wright. 2: 533 (1862)
This species is accepted
The native range of this species is Cuba. It is an annual and grows primarily in the seasonally dry tropical biome.

Descriptions

Morphology General Habit
Annual. Culms rambling; 100-200 cm long. Lateral branches ample. Leaf-sheaths glabrous on surface, or pilose; with tubercle-based hairs. Ligule a ciliate membrane; 1 mm long. Leaf-blades 5-15 cm long; 0.5-4 mm wide. Leaf-blade surface scabrous; rough on both sides. Leaf-blade margins cartilaginous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; oblong, or ovate; 5-15 cm long; 3-7 cm wide. Primary panicle branches ascending, or spreading; 1 -nate; rebranched below middle. Panicle branches stiff. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2-3 mm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets orbicular; dorsally compressed; 1 mm long; breaking up at maturity; disarticulating above glumes but not between florets.
Fertile
Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets orbicular; dorsally compressed; 1 mm long; breaking up at maturity; disarticulating above glumes but not between florets.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes deciduous; similar; shorter than spikelet; thinner than fertile lemma. Lower glume oblong; 0.9 length of spikelet; membranous; without keels; 3 -veined. Lower glume surface hispidulous. Lower glume apex acute. Upper glume ovate; 0.9 length of spikelet; membranous; without keels; 3 -veined. Upper glume surface hispidulous. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma orbicular; 1 mm long; coriaceous; without keel. Lemma surface pubescent. Lemma margins involute. Lemma apex obtuse. Palea coriaceous; 2 -veined.
Morphology Reproductive morphology Flowers
Anthers 3.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
Distribution
South America: Caribbean.
Reference
Isachneae. N Amer Fl 1994.
[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: 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

    • 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