Poaceae
Paspalum

Paspalum orbiculatum Poir.

First published in J.B.A.M.de Lamarck, Encycl. 5: 32 (1804)
This species is accepted
The native range of this species is Tropical & Subtropical America. It is a rhizomatous geophyte and grows primarily in the seasonally dry tropical biome.

Descriptions

Morphology General Habit
Perennial. Stolons present. Culms decumbent; 5-13 cm long; 0.5-1 mm diam.; rooting from lower nodes. Culm-internodes thin-walled; distally glabrous. Culm-nodes glabrous, or pubescent. Lateral branches ample. Leaf-sheaths outer margin hairy. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 0.1-0.2 mm long. Leaf-blade base broadly rounded; with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 1-6 cm long; 1-5 mm wide.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes 2-4; paired, or digitate; unilateral; 0.8-2.4 cm long. Central inflorescence axis 0.4-0.6 cm long. Rhachis narrowly winged; 0.5-0.7 mm wide. Spikelet packing abaxial; regular; 2 -rowed. 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; 0.9-1.2 mm long; 0.8-1 mm wide; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets orbicular; dorsally compressed; 0.9-1.2 mm long; 0.8-1 mm wide; falling entire.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes one the lower absent or obscure; reaching apex of florets; thinner than fertile lemma. Upper glume orbicular; 1 length of spikelet; membranous; without keels; 2 -veined. Upper glume primary vein absent. Upper glume apex obtuse.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; orbicular; 1 length of spikelet; membranous; 2 -veined; without midvein; obtuse. Fertile lemma ovate; 0.9-1.2 mm long; indurate; red; without keel. Lemma surface striate. Lemma margins involute. Palea involute; indurate.
Morphology Reproductive morphology Flowers
Anthers 3; 0.3 mm long; purple.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; orbicular; 0.7-0.8 mm long.
Distribution
North America: Mexico. South America: Mesoamericana, Caribbean, northern South America, western South America, Brazil, and southern South America.
Reference
Paniceae. Fl Costaric 1993.
[GB]

Distribution
Biogeografic region: Amazonia, Andean, Guiana Shield, Orinoquia. Elevation range: 0–1000 m a.s.l. Native to Colombia. Colombian departments: Amazonas, Antioquia, Caquetá, Guainía, Guaviare, Meta, Vaupés, Vichada.
Habit
Herb.
[UPFC]

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]

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. 0 - 1000 m.; Amazonia, Andes, Guayana y Serranía de La Macarena, Orinoquia.
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 2024. 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 2024. 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