[1] Cook, C.D.K. (1985) Range Extensions of Aquatic Vascular Plant Species. Journal of Aquatic Plant Management, 23, 1-6.
https://www.apms.org/japm/vol23/v23p1.pdf
[2] US Department of Agriculture Agricultural Research Service, USDA-ARS (2016) US National Plant Germplasm System, Online Database.
https://npgsweb.ars-grin.gov/gringlobal/search.aspx
[3] California Department of Food and Agriculture, CDFA (2010) A New Invader South American Sponge Plant: Worse than Water Hyacinth?.
https://www.cdfa.ca.gov/plant/ipc/hydrilla/sos/sos_flyer.pdf
[4] Anderson, L. (2011) Sponge plant: A New Aquatic Weed Threat in the Delta. Cal-IPC News, 19, 4-5.
[5] US Department of Agriculture and the California Department of Boating and Wa-terways USDA and CDBW (2012) Water Hyacinth Control Program Biological Assessment, 274.
http://www.dbw.ca.gov/pages/28702/files/WHCP-Biological_Assessment-121025.pdf
[6] Mackenzie, K.K. (1920) The Records for Limnobium spongia in the Northern United States. Torreya, 22,102-104.
http://www.jstor.org/stable/40596336?seq=1#page_scan_tab_contents
[7] Catling, P.M. and Dore, W.G. (1982) Status and Identification of Hydrocharis Morsus-Ranae and Limnobium Spongia in Northeastern North America. Rhodora, 84, 523-545.
[8] Cook, C.D.K. and Urmi-König, K. (1983) A Revision of the Genus Limnobium including Hydromystria (Hydrochari-taceae). Aquatic Botany, 17, 1-27.
https://doi.org/10.1016/0304-3770(83)90015-3
[9] California Department of Parks and Recreation, CDPR (2013) Water Hyacinth and Sponge Plant Control Programs: Water Hyacinth Control Program and Sponge Plant Control Program Aquatic Pesticide Application Plan. 15 p.
https://dbw.parks.ca.gov/pages/28702/files/WHCP%20SC
P%20Aquatic%20Pesticide%20Application%20Plan%202013.pdf
[10] Madsen, J. (2016) Personal Communication. 14 September 2016.
[11] Patrignani, A. and Ochsner, T.E. (2015) Canopeo: A Powerful New Tool for Measuring Fractional Green Canopy Cover. Agronomy Journal, 107, 2312-2320.
https://doi.org/10.2134/agronj15.0150
[12] SePRO (2017) Galleon® SC Aquatic Herbicide Specimen Label.
http://www.sepro.com/documents/Galleon_Label.pdf
[13] SePRO (2017) Clearcast® Aquatic Herbicide Specimen Label.
http://www.sepro.com/documents/Clearcast_Label.pdf
[14] Netherland, M. and Richardson, R.J. (2015) Evaluating Sensitivity of Five Aquatic Plants to a Novel Arylpicolinate Herbicide Utilizing an Organization for Economic Cooperation and Development. Weed Science, 64, 181-190.
https://doi.org/10.1614/WS-D-15-00092.1
[15] Getsinger, K.D., Poovey, A.G., Glomski, L., Slade, J.G., and Richardson, R.J. (2011) Utilization of Herbicide Concentration/Exposure Time Relationships for Controlling Submersed Invasive Plants on Lake Gaston, Virginia/North Carolina. US Army Corp Engineers, ERDC/EL TR-11-5, 16 p.
[16] Masser, M.P., Murphy, T.R., and Shelton, J.L. (2013) Aquatic Weed Management: Herbicides. Southern Regional Aquaculture Center, Publication No. 361.
http://aquaculture.ca.uky.edu/sites/aquaculture.ca.u
ky.edu/files/srac_361_aquatic_weed_management_herbicides.pdf
[17] SePRO (2017) Stingray® Aquatic Herbicide Specimen Label.
http://www.sepro.com/documents/Stingray_Label.pdf