| Ref ID | Type | Author | Date | Title |
|
29283
| Database | Ackerman, J. (director). | 2013 | University of Puerto Rico Herbarium (UPRRP) |
|
16045
| Database | Alexander, J., S. Markos, J. Yost, R.L. Moe, E. Dean, and M. Nazaire. | 2016 | Consortium of California Herbaria (CCH) |
|
10646
| Journal Article | Armstron, W.P. | 1984 | Noteworthy Collections, California, Spirodela punctata. |
|
10770
| Database | Ayers, T. (curator) | 2016 | Deaver Herbarium (NAU) |
|
10389
| Book | Beal, E.O., and J.W. Thieret. | 1986 | Aquatic and Wetland Plants of Kentucky. |
|
10379
| Book | Brown, E.T., and R. Athey. | 1992 | Vascular Plants of Kentucky an Annotated Checklist. |
|
25610
| Database | Calflora | 2021 | The Calflora Database: Information on California plants for education, research and conservation |
|
24369
| Database | Center for Invasive Species and Ecosystem Health. | 2019 | EDDMapS: Early detection and distribution mapping system |
|
10396
| Journal Article | Daubs, E.H. | 1962 | The occurrence of Spirodela oligorrhiza in the United States. |
|
10551
| Journal Article | Davenport, L.J., and R.R. Haynes | 1981 | Aquatic and marsh plants of Alabama II. Arecidae. |
|
10655
| Other | Dickinson, M.B. | 1991 | Interspecific competition, disturbance, and the maintenance of diversity in a community of small floating aquatic plants. |
|
10661
| Database | Farid, A. (curator). | 2018 | University of South Florida Herbarium (USF) |
|
10702
| Database | Florida Museum of Natural History | 2021 | University of Florida Herbarium (FLAS) |
|
10359
| Book | Gabrielson, F.C., Jr., A.M. Malatino, and G.J. Santa Cruz. | 1980 | Correlation of seasonal variations in phosphorous and nitrogen species in Upper Black Warrior River with duckweed. |
|
10674
| Database | Godwin, W. (collections). | 2016 | S.R. Warner Herbarium (SHST) |
|
10787
| Other | Haber, E. | 2001 | USA Records of Hydrocharis morsus-ranae in the Collections of Agriculture and AgriFoods Canada, Central Experimental Farm, Ottawa, Ontario (DAO), from Invasive Plants of Canada Database, National Botanical Services, Ottawa. |
|
10233
| Report | Helton, R.J., and L.H. Hartmann. | 1996 | Statewide Aquatic Vegetation Survey Summary, 1995 Report. |
|
10632
| Journal Article | Henry, R.D., and A.R. Scott | 1981 | Time of introduction of the alien component of the spontaneous Illinois vascular flora. |
|
10542
| Journal Article | Hill, S.R., and C.N. Horn. | 1997 | Additions to the Flora of South Carolina. |
|
10766
| Database | Hong-Wa, C. (curator). | 2015 | Claude E. Phillips Herbarium (DOV) |
|
10539
| Journal Article | Jones, S.B., Jr. | 1974 | Mississippi Flora. I. Monocotyledon families with aquatic or wetland species. |
|
10371
| Journal Article | Landolt, E. | 1981 | Distribution pattern of the family Lemnaceae in North Carolina. |
|
10692
| Journal Article | Landolt, E. | 1986 | The family of Lemnaceae - a monographic study. Vol.1 in Biosystematic investigations in the family of duckweeds (Lemnaceae) (vol. 2). |
|
19381
| Database | Madsen, J.D., G. Ervin, V. Maddox, & C. Abbott. | 2010 | Invasive Plant Atlas of the MidSouth. |
|
10397
| Book | Mason, H.L. | 1957 | A flora of the marshes of California. |
|
29204
| Database | McCormick, C. (curator). | 2016 | North Carolina Botanical Garden Herbarium (NCU) |
|
10238
| Database | Mehrhoff, L. | 1996 | Hawaiian flowering plants checklist |
|
27950
| Database | Michigan State University Board of Trustees. | 2019 | Midwest Invasive Species Information Network (MISIN) |
|
10342
| Book | Mohlenbrock, R.H. | 1986 | Guide to the vascular flora of Illinois, rev. ed. |
|
10765
| Report | Montz, G.N. | 1979 | Distribution of selected aquatic species in Louisiana |
|
13276
| Database | Neel, M. (director), J. Hall (curator), and N. Anderson. | 2014 | Norton-Brown Herbarium (MARY) |
|
13431
| Journal Article | Neill, A.K., and H.D. Wilson | 2001 | The vascular flora of Madison County, Texas. |
|
10355
| Book | Nelson, E.N., and R.W. Couch. | 1985 | Aquatic Plants of Oklahoma I: Submersed, Floating-leaved, and selected emergent macrophytes. |
|
10518
| Database | Pennsylvania Flora Database. | 2011 | Pennsylvania Flora Project |
|
10714
| Database | Regents of the University of California | 2015 | Jepsen online interchange for California floristics. |
|
10373
| Journal Article | Saeger, A. | 1934 | Spirodela oligorrhiza collected in Missouri. |
|
10395
| Journal Article | Saeger, A. | 1934 | Spirodela punctata collected in Missouri. |
|
29284
| Database | Santiago-Valentín, E. (director). | 2012 | Botanical Garden of the University of Puerto Rico Herbarium (UPR) |
|
10599
| Database | Sasek, T. (curator), and D. Bell. | 2007 | University of Louisiana at Monroe Herbarium (NLU) |
|
10335
| Journal Article | Simmons, M.P., D.M.E. Ware, and W.J. Hayden. | 1995 | The vascular flora of the Potomac River watershed of King George County, Virginia. |
|
10298
| Book | Smith, E.B. | 1988 | An atlas and annotated list of the vascular plants of Arkansas. |
|
10353
| Journal Article | Smith, L. | 1978 | Development of the emergent vegetation in a tropical marsh (Kawainui, I'ohu). |
|
16075
| Database | Smithsonian Institution | 2019 | United States National Herbarium (US) |
|
27701
| Database | Texas Invasive Plant and Pest Council. | 2018 | Texas Invasives Database |
|
10497
| Book | Thomas, R.D., and C.M. Allen. | 1993 | Atlas of the Vascular Flora of Louisiana. Vol I: Ferns and Fern Allies, Conifers, and Monocotyledons. |
|
25944
| Database | Ueda, K., J. Belmonte, A. Shepard, P. Leary, and S. Loarie. | 2021 | iNaturalist.org |
|
17830
| Database | University of Florida Herbarium. | 2016 | Florida Museum of Natural History |
|
10553
| Database | University of Georgia | 2021 | University of Georgia Herbarium (GA) |
|
28698
| Report | US Environmental Protection Agency. | 2016 | National Wetland Condition Assessment: 2011 Technical Report. EPA-843-R-15-006 |
|
10002
| Database | USDA, NRCS. | 1997 | The PLANTS database (http://plants.usda.gov). |
|
10367
| Journal Article | Wohler, J.R., I.M. Wohler, and R.T. Hartman | 1965 | The occurrence of Spirodela oligorrhiza in Western Pennsylvania. |
|
10225
| Web Page | Wunderlin, R.P., B.F. Hansen, and E.L. Bridges. | 1995 | Atlas of Florida Vascular Plants. |
|
10724
| Book | Yatskievych, G. | 1999 | Steyermark's Flora of Missouri, Vol 1. |
