''Sparganium acaule'' is a perennial plant found in the
United States of America
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territo ...
and
Canada
Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...
.
[Cook and Nicholls (1986) A monographic study of the genus ''Sparganium''. Part 1: Subgenus Xanthosparganium. Botanica Helvetica 96: 213-267.][Ito, Y., Nr. Tanaka, C.-K. Kim, R. Kaul, D. C. Albach (2016) Phylogeny of ''Sparganium'' (Typhaceae) revisited: Non-monophyletic nature of S. emersum sensu lato and resurrection of S. acaule. Plant Systematics and Evolution 302(1): 129-135.] This taxon was included within ''Sparganium emersum'' by Cook and Nicholls (1986)
[ but was recently resurrected as a distinct species.][
]
References
{{Taxonbar, from=Q22286433
acaule