Poaceae
Isachne

Isachne rigens (Sw.) Trin.

First published in Gram. Panic.: 252 (1826)
This species is accepted
The native range of this species is Guatemala, Caribbean, Venezuela to Peru. 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 rambling; 100-200 cm long; 0.5-1 mm diam.; wiry. Lateral branches ample. Leaves distichous. Leaf-sheaths longer than adjacent culm internode; glabrous on surface, or pubescent; outer margin hairy. Ligule a fringe of hairs; 0.5 mm long. Leaf-blades lanceolate; 2-5 cm long; 2-5 mm wide; herbaceous; firm. Leaf-blade midrib evident. Leaf-blade surface scabrous; rough on both sides. Leaf-blade margins cartilaginous; scabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; oblong, or ovate; 2-5 cm long. Primary panicle branches ascending, or spreading. Panicle branches stiff. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1-2 mm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets ovate, or orbicular; dorsally compressed; 1.8-2 mm long; breaking up at maturity; disarticulating above glumes but not between florets. Rhachilla internodes pubescent.
Fertile
Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets ovate, or orbicular; dorsally compressed; 1.8-2 mm long; breaking up at maturity; disarticulating above glumes but not between florets. Rhachilla internodes pubescent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes deciduous; similar; shorter than spikelet; thinner than fertile lemma. Lower glume oblong; 0.66-0.75 length of spikelet; membranous; without keels; 5 -veined. Lower glume surface puberulous. Lower glume apex obtuse. Upper glume orbicular; 0.66-0.75 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface puberulous. Upper glume apex obtuse.
Morphology Reproductive morphology Flowers Florets
Fertile lemma ovate, or orbicular; 1.8-2 mm long; coriaceous; without keel. Lemma margins involute. Lemma apex obtuse. Palea coriaceous; 2 -veined. Palea surface of upper floret puberulous.
Morphology Reproductive morphology Flowers
Anthers 3.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
Distribution
South America: Mesoamericana, Caribbean, northern South America, and western South America.
Reference
Isachneae. N Amer Fl 1994.
[GB]

Distribution
Biogeografic region: Andean. Elevation range: 1000–3000 m a.s.l. Native to Colombia. Colombian departments: Antioquia, Bogotá DC, Boyacá, Cundinamarca, Magdalena, Meta, Nariño, Putumayo, Santander.
Habit
Herb.
[UPFC]

Bernal, R., Gradstein, S.R. & Celis, M. (eds.). 2015. Catálogo de plantas y líquenes de Colombia. Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá. http://catalogoplantasdecolombia.unal.edu.co

Distribution
Nativa en Colombia; Alt. 1000 - 3000 m.; Andes, Sierra Nevada de Santa Marta.
Morphology General Habit
Hierba
Conservation
No Evaluada
[CPLC]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0

  • Catálogo de Plantas y Líquenes de Colombia

    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • 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

  • Useful Plants and Fungi of Colombia

    • http://creativecommons.org/licenses/by-nc-sa/3.0