Specimen Information

Pistia stratiotes
Pistia stratiotes
(water lettuce)

Specimen ID1396531
Common Namewater lettuce
Localitybackwater channel of the Mississippi River in Pool 5 near Weaver, MN. located in Upper Mississippi River National Wildlife and Fish Refuge. Along an approximately 1 mile stretch of backwater channel. Lat/long is central area of channel location.
Mapping AccuracyAccurate
HUC8 NameBuffalo-Whitewater
HUC8 Number07040003
HUC10 NameCity of Winona-Mississippi River
HUC10 Number0704000306
HUC12 NameBuffalo City-Mississippi River
HUC12 Number070400030604
Collection Day24
Collection Month8
Collection Year2012
Year AccuracyActual
Potential Pathwayunknown
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
CommentsInitial finding was on 8-22-2012 by Ed Lagace who is familiar with the plant. Further recon on 8-24 and 8-27 revealed the extent of the infestation. Most of the plants floating along channel with thick duckweed slowing their progress. One location had two large mats of plants. On Sep. 5 and 14, 2012, staff removed lettuce from site by collecting by hand, bagging, and removing from area. An estimated 27,000 plants (including mothers and daughters) were removed. The site was rechecked the following week and 20 plants were collected. voucher specimen is in process of being made.; EDDMapS report
Record TypeLiterature
VerifierKeegan Lund
Size0.3 Acres


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Citation information: U.S. Geological Survey. [2021]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [1/19/2021].

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