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Genus: SPIRODELA - Family: LEMNACEAE

 LEMNACEAE
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Scientific name	Google Search	Distribution in USA and Canada (*)	Common names	Grown habit	Duration
Spirodela intermedia W.D.J. Koch		- Map for Spirodela intermedia W.D.J. Koch (*)	intermediate duckweed	-	-
Spirodela polyrrhiza (L.) Schleid. = Lemna polyrrhiza L. = Spirodela polyrhiza (L.) Schleiden, orth. var. = Spirodela polyrrhiza (L.) Schleid. var. masonii Daubs		USA (AL, AR, AZ, CA, CO, CT, DC, DE, FL, GA, HI, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WA, WI, WV, WY), USA+ (PR), CAN (AB, BC, MB, NB, NS, ON, PE, QC, SK) Map for Spirodela polyrrhiza (L.) Schleid. (*)	common duckmeat	Forb/herb	Perennial

(*) USDA, NRCS. 2009. The PLANTS Database (http://plants.usda.gov, 28 August 2009). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.

PICTURES

Spirodela polyrhiza USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 1: 446.	Spirodela polyrhiza Hippolyte Coste - Flore descriptive et illustrée de la France, de la Corse et des contrées limitrophes, 1901-1906 - This image is in public domain because its copyright has expired.	Spirodela polyrhiza Credit: Photo by Franco Giordana
Spirodela polyrhiza Credit: Photo by Franco Giordana	Spirodela polyrhiza Credit: Photo by Franco Giordana	Spirodela polyrrhiza Robert H. Mohlenbrock USDA-NRCS PLANTS Database / USDA NRCS. 1992. Western wetland flora: Field office guide to plant species. West Region, Sacramento. - Not copyrighted image
Spirodela polyrrhiza Robert H. Mohlenbrock USDA-NRCS PLANTS Database / USDA NRCS. 1992. Western wetland flora: Field office guide to plant species. West Region, Sacramento. - Not copyrighted image	Spirodela polyrrhiza USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 1: 446.

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L.R. 2009