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Park			Taxon Code
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National Park Service
U.S. Department of the Interior

NPSpecies - Park Species Profile


Spirodela polyrrhiza
greater duckweed
Apostle Islands National Lakeshore
			Record Status: Approved
Occurrence:	Present
Nativeness:	Native
Abundance:	Rare

Scientific Name with Authority:		Spirodela polyrrhiza (L.) Schleid.
Park Preferred Common Name(s):		greater duckweed
Park Synonyms:

Taxonomic Hierarchy:		Kingdom Plantae, Phylum Tracheophyta, Subphylum Spermatophytina, Order Alismatales, Family Araceae, Genus Spirodela, Species Spirodela polyrrhiza


Park Tags:
ParkTag -


Threatened/Endangered Status:
State Species of Concern Status:
Ozone-sensitive Status:
NatureServe Global Rank:
NatureServe State Rank:
Evidence:		0 Observations, 0 Vouchers, 2 Data Store References, 0 External Links


Other Parks Where Species is Listed:
Alibates Flint Quarries National Monument	Arkansas Post National Memorial
Buffalo National River	Cape Hatteras National Seashore
Cumberland Island National Seashore	Cuyahoga Valley National Park
Eleanor Roosevelt National Historic Site	George Washington Birthplace National Monument
George Washington Memorial Parkway	Grand Portage National Monument
Great Falls Park	Indiana Dunes National Park
Jean Lafitte National Historical Park and Preserve	Lake Meredith National Recreation Area
Mammoth Cave National Park	Martin Van Buren National Historic Site
Minute Man National Historical Park	Mississippi National River and Recreation Areas
Niobrara National Scenic River	Ozark National Scenic Riverways
Pipestone National Monument	Piscataway Park
Point Reyes National Seashore	Richmond National Battlefield Park
Saint Croix National Scenic Riverway	Saratoga National Historical Park
Shiloh National Military Park	Stones River National Battlefield


Last Modified Date:	12/29/2004

NPSpecies - The National Park Service biodiversity database. IRMA Portal version.https://irma.nps.gov/npspecies. Accessed 10/11/2025 3:01:47 PM

NatureServe Global Rank and State Rank

NatureServe. 2017. NatureServe Web Service. Arlington, VA. U.S.A. Available http://services.natureserve.org. Accessed: 12/4/2017. Updated quarterly.

This information is provided by NatureServe (www.natureserve.org) and its network of natural heritage member programs, a leading source of information about rare and endangered species, and threatened ecosystems.


Species Profile	Page 1 of 1	10/11/2025 3:01:47 PM

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