Alismataceae
Aquarius

Aquarius grandiflorus (Cham. & Schltdl.) Christenh. & Byng

First published in Global Fl. 4: 53 (2018)
This species is accepted
The native range of this species is NW. Florida, Bolivia to S. Brazil and N. Argentina. It is a helophyte and grows primarily in the subtropical 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]

Lehtonen, S. (2008). An integrative approach to species delimitation in Echinodorus (Alismataceae) and the description of two new species. Kew Bulletin 63: 525. https://doi.org/10.1007/s12225-008-9068-0

Type
Based on the type of Alisma grandiflorum: Brazil, Sellow s.n. (lectotype LE; isolectotypes BM, BR!, E-GL, K [digital image!], MO [digital image!], selected by Haynes & Holm-Nielsen 1986).
Morphology General Habit
Perennial, from horizontal rhizomes, petioles and peduncles glabrous to pubescent, to 180 cm, rhizomes to 15 cm long, 3 cm diam. Leaves emersed, blades oval to ovate, glabrous to stellate pubescent on lower surface, 7 – 13-veined, 15 – 50 cm long, 5.5 – 30 cm wide, pellucid markings present as dots and short lines, apex acute to rounded, base attenuate to shallowly cordate, petiole terete, glabrous to stellate-pubescent, usually with a node-like thickening below the blades, up to 120 cm long, 0.3 – 2 cm diam., base with a sheath to 16 cm long
Morphology Reproductive morphology Inflorescences
Inflorescence paniculate, of 5 – 13 whorls, each 7 – 19-flowered, erect, overtopping leaves, proliferating, to 55 cm long, and to 25 cm wide, rachis terete to triangular in cross-section, peduncles terete, glabrous to stellate pubescent, to 140 cm long, 1.2 cm diam., bracts lanceolate, coarse, 1.5 – 4.5 cm long, 6 – 14 mm wide, 10 – 20-veined, apex acuminate, pedicels spreading in flower and fruit, 1.5 – 6.5 cm long, 1 mm diam. Flowers 3.5 – 5 cm diam., weakly fragrant, sepals erect, 13 – 25-veined, 7 mm long, 5 mm wide, veins without papillae, petals spreading, white, not clawed, overlapping, c. 22 mm long, 20 mm wide, stamens 21 – 35, anthers versatile, c. 2 mm long, filaments c. 1.5 mm long, carpels numerous
Morphology Reproductive morphology Fruits
Fruit oblanceoloid, 3 – 4-ribbed, glandular, 2 – 3 mm long, 1 mm wide, glands 2 – 3, separated by ribs, elongate, beak terminal, erect, 0.2 – 0.5 mm.
Distribution
Coastal area from the mouth of Río Negro in Argentina through Uruguay to the state of Paraná in Brazil. An outlying population in Florida, USA.
Ecology
Growing at sea level in flowing water along rivers and creeks, most common in river deltas.
Phenology
Flowering and fruiting from November to May in South America, from April to October in USA.
[KBu]

Common Names

English
Rangeri Sword

Sources

  • Angiosperm Extinction Risk Predictions v1

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

  • 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 Bulletin

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

  • Kew Living Collection Database

    • Common Names from Plants and People Africa http://www.plantsandpeopleafrica.com/

  • 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

  • Kew Science Photographs

    • Copyright applied to individual images

  • Neotropikey

    • Milliken, W., Klitgard, B. and Baracat, A. (2009 onwards), Neotropikey - Interactive key and information resources for flowering plants of the Neotropics.
    • http://creativecommons.org/licenses/by/3.0