| Callitriche heterophylla | US, FL, Jefferson County, Wacissa | S.W. Leonard | | 20/3/1983 | FSU |
| Callitriche heterophylla | US, FL, Leon County, Tallahassee | Robert K Godfrey | Florida State University, Robert K. Godfrey Herbarium | 6/4/1971 | FSU |
| Callitriche heterophylla | US, FL, Leon County, Tallahassee | Robert K Godfrey | | 9/3/1958 | FSU |
| Callitriche heterophylla | US, FL, Franklin County, Saint Vincent Island | Loran C Anderson | Apalachicola National Estuarine Sanctuary | 2/4/1987 | FSU |
| Callitriche heterophylla | US, FL, Franklin County, Saint Vincent Island | Loran C Anderson | | 18/4/1984 | FSU |
| Callitriche heterophylla | US, FL, Franklin County, Ochlockonee River | Loran C Anderson | | 22/4/1985 | FSU |
| Callitriche heterophylla | US, FL, Putnam County, Crystal Cove | Loran C Anderson | | 4/5/2010 | FSU |
| Callitriche heterophylla | US, FL, Franklin County, Cow Creek | Loran C Anderson | | 4/4/1998 | FSU |
| Callitriche heterophylla | US, FL, Franklin County, Cow Creek | Loran C Anderson | | 27/4/1991 | FSU |
| Callitriche heterophylla | US, FL, Escambia County, Century | James R Burkhalter | | 24/3/1984 | FSU |
| Callitriche heterophylla | US, FL, Clay County, Bayard State Conservation Area | Loran C Anderson | Florida State University, Robert K. Godfrey Herbarium | 24/7/1999 | FSU |
| Callitriche heterophylla | US, FL, Leon County, 2 miles north of Tallahassee | Robert K Godfrey | | 9/3/1958 | FSU |
| Callitriche heterophylla | US, FL, Jefferson County | William P Adams | | 7/4/1960 | FSU |
| Callitriche heterophylla | US, FL | Loran C Anderson | Florida State University, Robert K. Godfrey Herbarium | 22/4/1985 | FSU |
| Callitriche platycarpa | SE, Sk, Kristianstad | Wahlstedt | Allan Octavian Hume J Bignall Pratt | 8/1887 | SLBI |
| Callitriche hamulata | IE, VCH40 Co. Londonderry, Ringsend | Mary Patricia Happer Kertland | Queens University Belfast | 10/1959 | GALW |
| Callitriche hermaphroditica | IE, VCH39 Co. Antrim, Toome | Robert Lloyd Praeger | Robert Lloyd Praeger | 6/1893 | DBC |
| Callitriche autumnalis | IE, VCH39 Co. Antrim, Lough Neagh | Coslett Herbert Waddell | Watson Botanical Exchange Club Augustin Ley Coslett Herbert Waddell | 13/8/1909 | BIRM |
| Callitriche obtusangula | IE, VCH39 Co. Antrim, Giants Causeway | James Sykes Gamble | James Sykes Gamble | 5/1888 | K |
| Callitriche hermaphroditica | IE, VCH39 Co. Antrim, Antrim | William Mateer | Harold Stuart Thompson Thomas Clark | | BIRM |
| Callitriche hamulata | IE, VCH38 Co. Down, Sheepbridge | Henry William Lett | Watson Botanical Exchange Club Harold Stuart Thompson Henry William Lett | 6/6/1901 | BIRM |
| Callitriche stagnalis | IE, VCH38 Co. Down, Newcastle | Mary Patricia Happer Kertland | Queens University Belfast | 9/1961 | GALW |
| Callitriche brutia | IE, VCH38 Co. Down, Holywood | | Benjamin Thompson Lowne jnr | 1850 | K |
| Callitriche brutia | IE, VCH38 Co. Down, Holywood | William Mateer | Donor Unknown William Mateer | 7/1847 | BIRM |
| Callitriche hamulata | IE, VCH38 Co. Down, Castlewellan Forest Park | Samuel Alexander Stewart | Watson Botanical Exchange Club Coslett Herbert Waddell Harold Stuart Thompson | 7/6/1897 | BIRM |
| Callitriche obtusangula | IE, VCH38 Co. Down, Belfast Harbour | | Coslett Herbert Waddell John Innes Horticultural Institute | 7/1904 | K |
| Callitriche hermaphroditica | IE, VCH38 Co. Down, Aughnadarragh | Coslett Herbert Waddell | Allan Octavian Hume Coslett Herbert Waddell | 8/1896 | SLBI |
| Callitriche intermedia | IE, VCH38 Co. Down, Aughnadarragh | Coslett Herbert Waddell | Coslett Herbert Waddell John Innes Horticultural Institute | 8/1896 | K |
| Callitriche intermedia | IE, VCH33 Fermanagh, Ross Lough | Robert Desmond Meikle | | 13/7/1954 | K |
| Callitriche obtusangula | IE, VCH33 Fermanagh, Lough Inver | Robert Desmond Meikle | | 13/7/1956 | K |
| Callitriche intermedia | IE, VCH33 Fermanagh, Lisnaskea | Robert Desmond Meikle | | 13/7/1956 | K |
| Callitriche intermedia | IE, VCH33 Fermanagh, Kesh | Robert Desmond Meikle | | 9/7/1956 | K |
| Callitriche platycarpa | IE, VCH33 Fermanagh, Inishrook | Robert Desmond Meikle | | 31/8/1955 | K |
| Callitriche obtusangula | IE, VCH33 Fermanagh, Fivemiletown | Edward Norman Carrothers | | 7/1955 | K |
| Callitriche intermedia | IE, VCH33 Fermanagh, Blaney | Edward Norman Carrothers | | 7/1955 | K |
| Callitriche intermedia | IE, VCH33 Fermanagh, Ballinamallard | Edward Norman Carrothers | | 7/1955 | K |
| Callitriche intermedia | IE, VCH33 Fermanagh, Ballanamallard | Edward Norman Carrothers | | 7/1955 | K |
| Callitriche intermedia | IE, VCH33 Fermanagh | Robert Desmond Meikle | | 11/7/1956 | K |
| Callitriche intermedia | IE, VCH28 Co. Sligo, Geevagh | David Allardice Webb | | 13/8/1952 | K |
| Callitriche brutia | IE, VCH27 West Mayo, Mullet | Charles Cardale Babington | | | K |