The Nonindigenous Occurrences section of the NAS species profiles has a new structure. The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables.

Myosotis scorpioides
Myosotis scorpioides

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Myosotis scorpioides L.

Common name: forget-me-not

Synonyms and Other Names: Myosotis palustris, Water Forget-me-not, Yelloweye forget-me-not, Scorpion Weed, Love-me, Marsh Scorpion Grass, Mouse-Ear Scorpion Grass, Snake Grass

Taxonomy: available through www.itis.govITIS logo

Identification: This species is an erect, perennial, 4"-24" tall forb, with hairy stems. It is often creeping and has fibrous roots. Forget-me-not has blue five-petaled flowers with a yellow center, 1/4"-3/8" wide, with petals flat at the top of the tube, calyx with flat, tight hairs, and lobes much shorter than the tube. Inflorescence is a terminal, curving, branched cluster (cyme) that produces smooth, shiny nutlets on spreading stalks. Leaves are alternate, stalkless, hairy, and evergreen in ponds. This species blooms from May to September.

Size: 6 to 12 inches tall (15-30 cm), 9 to 12 inches spread (22-30 cm)

Native Range: Europe and Asia (native to moist meadows and stream banks from Europe to Siberia).

Hydrologic Unit Codes (HUCs) Explained
Interactive maps: Point Distribution Maps

Nonindigenous Occurrences:

Table 1. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Myosotis scorpioides are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
AL200820081South Atlantic-Gulf Region
AK1998201814Baranof Island; Burroughs Bay; Chilkat-Skagway Rivers; Eastern Prince William Sound; Etolin-Zarembo-Wrangell Islands; Glacier Bay; Holkham Bay; Ketchikan; Kuiu-Kupreanof-Mitkof Islands; Lower Copper River; Lynn Canal; Prince of Wales; Stikine River; Upper Kenai Peninsula
AZ200820081Lower Colorado Region
CA200820081California Region
CT200820092New England Region; Outlet Connecticut River
DC200820081Mid Atlantic Region
GA200720202South Atlantic-Gulf Region; Upper Chattahoochee
ID200820081Pacific Northwest Region
IL1897201314Apple-Plum; Des Plaines; Kankakee; La Moine; Lower Fox; Lower Illinois-Lake Chautauqua; Lower Rock; Pike-Root; Rock; Upper Fox; Upper Illinois; Upper Mississippi Region; Vermilion; Vermilion
IN200820087Eel; Kankakee; Little Calumet-Galien; Lower White; Patoka-White; St. Joseph; Upper White
ME200820081New England Region
MD200820216Conococheague-Opequon; Gunpowder-Patapsco; Mid Atlantic Region; Monocacy; Severn; Youghiogheny
MA186720082Charles; New England Region
MI1903201834Au Sable; Bad-Montreal; Betsie-Platte; Black-Presque Isle; Boardman-Charlevoix; Brule; Clinton; Dead-Kelsey; Great Lakes Region; Huron; Keweenaw Peninsula; Lake Huron; Manistee; Manistique River; Michigamme; Northeastern Lake Michigan; Northwestern Lake Huron; Northwestern Lake Michigan; Ontonagon; Pere Marquette-White; Pigeon-Wiscoggin; Pine; Southcentral Lake Superior; Southeastern Lake Michigan; Southwestern Lake Huron; St. Clair; St. Clair-Detroit; St. Joseph; St. Marys; Sturgeon; Thunder Bay; Upper Grand; Waiska; Western Lake Erie
MN200720118Kettle; Lower St. Croix; Mississippi Headwaters; Northwestern Lake Superior; Root; St. Louis; Upper Mississippi-Crow-Rum; Zumbro
NH200620082Ammonoosuc River-Connecticut River; New England
NJ200820207Cohansey-Maurice; Hackensack-Passaic; Mid-Atlantic Region; Middle Delaware-Musconetcong; Raritan; Rondout; Sandy Hook-Staten Island
NY1886201432Bronx; Cattaraugus; Chemung; Chenango; Conewango; Eastern Lake Erie; Hudson-Hoosic; Hudson-Wappinger; Indian; Lake Ontario; Long Island; Lower Genesee; Lower Hudson; Lower Hudson; Middle Hudson; Mohawk; Northeastern Lake Ontario; Oak Orchard-Twelvemile; Oneida; Oswego; Oswego; Rondout; Sandy Hook-Staten Island; Schoharie; Seneca; Southern Long Island; St. Lawrence; Upper Delaware; Upper Genesee; Upper Hudson; Upper Susquehanna; Upper Susquehanna
NC200820205Nolichucky; Upper Catawba; Upper French Broad; Upper New; Watauga, North Carolina, Tennessee
OH2008201824Ashtabula-Chagrin; Black-Rocky; Cuyahoga; Hocking; Huron-Vermilion; Lake Erie; Licking; Little Miami; Lower Great Miami, Indiana, Ohio; Lower Maumee; Lower Scioto; Mahoning; Middle Ohio-LittleMiami; Middle Ohio-Raccoon; Mohican; Muskingum; Paint; Southern Lake Erie; Tuscarawas; Upper Ohio; Upper Ohio-Beaver; Upper Scioto; Walhonding; Western Lake Erie
OR1924201913Alsea; Lower Columbia; Lower Columbia-Clatskanie; Lower Crooked; Lower Grande Ronde; Molalla-Pudding; North Santiam; Pacific Northwest Region; Siltcoos; South Santiam; Upper Deschutes; Upper Willamette; Wallowa
PA1935202049Allegheny; Bald Eagle; Brandywine-Christina; Chautauqua-Conneaut; Conemaugh; Connoquenessing; Crosswicks-Neshaminy; Delaware; French; Kiskiminetas; Lackawaxen; Lake Erie; Lehigh; Lower Allegheny; Lower Delaware; Lower Delaware; Lower Juniata; Lower Monongahela; Lower Susquehanna; Lower Susquehanna; Lower Susquehanna-Penns; Lower Susquehanna-Swatara; Lower West Branch Susquehanna; Mahoning; Mid Atlantic Region; Middle Allegheny-Tionesta; Middle Delaware-Mongaup-Brodhead; Middle Delaware-Musconetcong; Middle West Branch Susquehanna; Monongahela; Pine; Raystown; Schuylkill; Shenango; Sinnemahoning; Tioga; Upper Allegheny; Upper Delaware; Upper Delaware; Upper Juniata; Upper Ohio; Upper Ohio-Beaver; Upper Susquehanna; Upper Susquehanna; Upper Susquehanna-Lackawanna; Upper Susquehanna-Tunkhannock; Upper West Branch Susquehanna; West Branch Susquehanna; Youghiogheny
RI200820081New England Region
SD200820081Missouri Region
TN200820191Watauga, North Carolina, Tennessee
VA201220203Middle Potomac-Anacostia-Occoquan; Middle Potomac-Catoctin; South Fork Holston
WA1997200811Deschutes; Duwamish; Lake Washington; Little Spokane; Lower Chehalis; Lower Cowlitz; Nisqually; Pacific Northwest Region; Puget Sound; Puyallup; Upper Chehalis
WI1953201845Bad-Montreal; Beartrap-Nemadji; Black; Black-Presque Isle; Brule; Buffalo-Whitewater; Castle Rock; Chippewa; Door-Kewaunee; Eau Claire; Flambeau; Fox; La Crosse-Pine; Lake Dubay; Lake Michigan; Lake Superior; Lower Chippewa; Lower St. Croix; Manitowoc-Sheboygan; Menominee; Milwaukee; Namekagon; Northwestern Lake Michigan; Northwestern Lake Michigan; Oconto; Ontonagon; Peshtigo; Pike-Root; Red Cedar; Rock; South Fork Flambeau; Southwestern Lake Michigan; Southwestern Lake Superior; St. Croix; St. Louis; Upper Chippewa; Upper Fox; Upper Fox; Upper Mississippi Region; Upper Mississippi-Maquoketa-Plum; Upper Rock; Upper St. Croix; Upper Wisconsin; Wisconsin; Wolf

Table last updated 6/21/2024

† Populations may not be currently present.

* HUCs are not listed for states where the observation(s) cannot be approximated to a HUC (e.g. state centroids or Canadian provinces).

Ecology: Prefered habitat for this species includes wet areas, such as shores, shallows, streambanks, and springs. It may form rafts in slow-moving streams can can remain submerged in up to 3 inches of water. It blooms from May to October in temperate climates.

Means of Introduction: Intentionally introduced for ornamental cultivation, garden escapes.

Status: Introduced and naturalized. Despite some reports of this species being ecologically invasive, it is widespread and generally of low concern.

Impact of Introduction: Competes with native plants in wet habitats, but valued for its sky-blue flowers as an ornamental. Like other wetland plants, water forget-me-not offers resting places for aquatic winged insects such as caddis flies and alder flies. It also has nectar and pollen for bees. This plant is found partly submerged in or beside fresh water but also grows in marshes and fens. It is commonly planted in pond margins or bog gardens.

Remarks: Similar species: M. laxa has smaller flowers (2-6 mm) and lobes of its calyx are about 1/2 its total length

References: (click for full references)

Dudley, W.R. 1886. The Cayuga flora. Part 1: A catalogue of the Phaenogamia growing in cultivation in the Cayuga Lake basin. Cornell University Bulletin.

Environmental Assessment Program. 2018. Washington State Lakes Environmental Data Version 1.0. Washington State Department of Ecology, Lacey, WA. https://fortress.wa.gov/ecy/coastalatlas/tools/LakeDetail.aspx. Accessed on 12/18/2018.

Gray, A. 1889. Manual of the Botany of the Northern United States. Sixth Edition. New York: American Book Co.

GRIN Taxonomy for Plants. 2008. Myosotis scorpioides. http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?24815.

iMapInvasives. 2016. Oregon iMapInvasives. Oregon Biodiversity Information Center, Portland, OR. https://sites.google.com/site/orimapresources/. Accessed on 04/09/2015.

Germ, M., and A. Gaberscik. 2003. Comparison of aerial and submerged leaves in two amphibious species Myosotis scorpioides and Ranunculus trichophyllus. Photosynthetica 41(1):91-96.

Mills, E.L., J.H. Leach, J.T. Carlton, and C.L. Secor. 1993. Exotic species in the Great Lakes: a history of biotic crises and anthropogenic introductions. Journal of Great Lakes Research 19(1):1-54.

Natural England. 2008. Water forget-me-not - Myosotis scorpioides. http://www.plantpress.com/wildlife/o843-waterforgetmenot.php.

Plant for A Future. 2008. Myosotis scorpioides. http://www.ibiblio.org/pfaf/cgi-bin/arr_html?Myosotis+scorpioides.

Soper, J.H., Garton, C.E., and Given, D.R. 1989. Flora of the North Shore of Lake Superior. Syllogeus 63. National Museums of Natural Sciences, National Museums of Canada.

USDA, NRCS. 1997. The PLANTS database (http://plants.usda.gov). National Plant Data Center, Baton Rouge, Louisiana 70874-4490. http://plants.usda.gov.

Wisconsin Department of Natural Resources (WI DNR). 2018. Surface Water Integrated Monitoring System (SWIMS). Wisconsin Department of Natural Resources, Madison, WI. https://dnrx.wisconsin.gov/swims/viewRoi.html.



Author: Cao, L., and R. Sturtevant

Revision Date: 8/15/2019

Citation Information:
Cao, L., and R. Sturtevant, 2024, Myosotis scorpioides L.: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=2686, Revision Date: 8/15/2019, Access Date: 6/21/2024

This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.


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Citation information: U.S. Geological Survey. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [6/21/2024].

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