Specimen Information

Glyceria maxima
Glyceria maxima
(reed mannagrass)

Specimen ID1421484
Common Namereed mannagrass
LocalityOld Channel Zumbro River, North of McCarthy Lake
Mapping AccuracyAccurate
HUC8 NameBuffalo-Whitewater
HUC8 Number07040003
HUC10 NameCity of Winona-Mississippi River
HUC10 Number0704000306
HUC12 NameSnake Creek
HUC12 Number070400030602
Collection Day25
Collection Month6
Collection Year2016
Year AccuracyActual
Potential Pathwayescaped captivity farm | hitch hiker on plants
Reference 1
Ref. Number:24369
Author:Center for Invasive Species and Ecosystem Health.
Title:EDDMapS: Early detection and distribution mapping system
Publisher:The University of Georgia
CommentsGlyceria sp? suspicious of species maxima, reed mannagrass. Visited the area in January 2016 with 2 follow up visits to collect viable material. Keyed plant to Glyceria sp representing as maxima and grandis. Sent specimen to state entities for further diagnostics, specimen sent to WI. Sent viable material to Utah State for genetic testing. Sequencing completed early May 2017, analysis following with species id. Genetics verify maxima. EDDMapS report
Record TypeLiterature
Earliest Recorddrainage
VerifierUtah State University
Year ClassSeedling/Rosette
Size13 acres
Glyceria maxima
Glyceria maxima
Glyceria maxima
Glyceria maxima


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Citation information: U.S. Geological Survey. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [4/17/2024].

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