A taxonomic treatment of Alismataceae (Alismatales) in the Brazilian Pantanal
: Pestana, Mateus C. A.; Lehtonen, Samuli; Falck, Daniel; Silva, Fernando H. B.; Silva, Emerson P.; Giaretta, Augusto
Publisher: MAGNOLIA PRESS
: 2025
Phytotaxa
: 721
: 1
: 1
: 49
: 1179-3155
: 1179-3163
DOI: https://doi.org/10.11646/phytotaxa.721.1.1
: https://phytotaxa.mapress.com/pt/article/view/phytotaxa.721.1.1
: https://research.utu.fi/converis/portal/detail/Publication/504988045
This study provides a taxonomic treatment of Alismataceae species occurring in the Brazilian Pantanal. Field collections were carried out and analysis of sheets housed in the most representative herbaria of Pantanal were consulted. A total of five genera and 19 species were confirmed in the Brazilian Pantanal. Echinodorus was the most representative genus, with nine species, followed by Sagittaria with four. Taxonomic analyses exclude E. cylindricus and E. lanceolatus, which were reassigned as E. glaucus. Echinodorus grandiflorus was identified as E. longiscapus, and specimens previously identified as E. macrophyllus were mostly updated as E. scaber, with a few reassigned as E. floribundus. New records in E. longiscapus, E. grisebachii and S. planitiana were also documented. Additionally, Aquarius is here proposed as a synonym of Echinodorus, as its segregation is considered unjustified. This study also provides the lectotypification of Sagittaria montevidensis, based on study of original material preserved at G and HAL herbaria. The taxonomic treatment includes identification keys, morphological descriptions, diagnostic and comparative notes for morphologically related taxa, discussions on previously reported taxa, photographic plates, illustrations, and species distribution maps.
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This work is part of the Master’s thesis of M.C.A.P. (M.Sc. in Biodiversity and Environment, Universidade Federal
da Grande Dourados, Brazil), funded in part by the Fundação Coordenação de Aperfeiçoamento de Pessoal de Nível
Superior—Brasil (CAPES)—Finance Code 001. The authors thank the Universidade Federal da Grande Dourados
for providing infrastructure, and the Sociedade Botânica do Brasil for supporting botanical illustrations through the
Scientia Amabilis award. We also thank the staff and curators of the CGMS, COR, CEN, CPAP, ICN, and UFMT
herbaria for granting access to their collections. We thank the curators of the herbaria G and HAL for providing
access to high-quality online images of the original material of Sagittaria montevidensis, and to the Field Museum
(FM) for making available the historical photograph of the syntype of this species formerly housed at B. We are
especially grateful to Prof. Dr. Uwe Braun for kindly sharing historical information on Schlechtendal’s collections
and confirming the typification status of the material preserved at HAL. We are grateful to Prof. Dr. Flávio M. Alves
(UFMS) and Rafael F. de Oliveira (UFMA) for discussions on nomenclature. We acknowledge the financial support
of the Oskar Öflund Foundation, which enabled S.L. and D.F. to participate in the 2024 fieldwork in the Pantanal.
