Poaceae
Aristida

Aristida riparia Trin.

First published in Mém. Acad. Imp. Sci. Saint-Pétersbourg, Sér. 6, Sci. Math., Seconde Pt. Sci. Nat. 4(2, Bot.): 48 (1836)
This species is accepted
The native range of this species is Panama to S. Tropical America. It is a perennial and grows primarily in the seasonally dry tropical biome.

Descriptions

Morphology General Habit
Perennial. Culms (60-)90-130(-180) cm long. Lateral branches lacking. Leaf-sheath oral hairs bearded. Ligule a fringe of hairs; 0.4-0.8 mm long. Collar glabrous. Leaf-blades straight, or curled (lower, very rarely); flat, or convolute (upper, rarely); 19-70 cm long; (2.8-)3-5 mm wide. Leaf-blade surface scabrous; rough on both sides; pilose (at base); densely hairy (lanose at base, adaxially); hairy adaxially. Leaf-blade apex acute; antrorsely scabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle spiciform; 20-44 cm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets subterete; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; straight; 1-1.5 mm long; bearded; acute.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets subterete; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; straight; 1-1.5 mm long; bearded; acute.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; dissimilar (lower longer than upper). Lower glume lanceolate; 12-22 mm long; 1 -veined. Lower glume primary vein scabrous. Lower glume surface scabrous; rough generally. Lower glume apex acute, or acuminate; awned. Upper glume lanceolate; 10-22 mm long; 1 -veined. Upper glume surface smooth. Upper glume apex entire; acute, or acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma subterete; 6-8 mm long; without keel; rounded throughout; 3 -veined. Lemma surface smooth; without grooves. Lemma margins convolute. Lemma apex awned; 3 -awned. Principal lemma awn straight; ascending; simple at base; with (26-)32-64 mm long limb; with twisted column. Column of lemma awn (6-)14-24(-52) mm long (sometimes variation in the same inflorescence). Lateral lemma awns ascending; 22-42(-60) mm long; subequal to principal.
Distribution
South America: Mesoamericana, northern South America, western South America, Brazil, and southern South America.
Reference
Aristideae. Lo-W 1993.
[GB]

Distribution
Biogeografic region: Orinoquia. Elevation range: 0–500 m a.s.l. Native to Colombia. Colombian departments: Casanare, Meta, Vichada.
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. 0 - 500 m.; Orinoquia.
Morphology General Habit
Hierba
Conservation
No Evaluada
[CPLC]

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

  • 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