L.
Identity
Unique IDELEMENT_GLOBAL.2.151877
Element CodePDCLL010F0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
IUCNLeast concern
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderPlantaginales
FamilyPlantaginaceae
GenusCallitriche
Other Common NamesCallitriche des marais (FR) vernal water-starwort (EN)
Concept ReferenceKartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2025-07-14
Change Date1994-01-07
Edition Date2025-07-14
Edition AuthorsAnnable, C. (1994), rev. N. Ventrella (2025)
Threat ImpactUnknown
Range Extent>2,500,000 square km (greater than 1,000,000 square miles)
Number of Occurrences> 300
Rank ReasonsCallitriche palustris is an aquatic perennial forb occurring in rivers, streams, swamps, bogs, lakes, ponds, and springs worldwide, in North America, Greenland, Eurasia, and as an introduced species in Australia. In North America, it occurs throughout all of Canada and Alaska throughout the western United States, south to Mexico, east to Texas and Missouri, Ohio, and Virginia, and north through Maine in the United States. There are several thousand estimated occurrences of this species rangewide, which are potentially threatened by development, recreation, changes to water quality and temperature, invasive species, and alterations to hydrology. Little is known about threats and trends, but with a large range extent, abundant habitat, and broad habitat preferences, Callitriche palustris is considered secure.
Range Extent CommentsCallitriche palustris is widely distributed throughout the northern hemisphere, occurring in North America, Greenland, Eurasia, and as an introduced species in Australia (FNA 2019, POWO 2025). In North America, it occurs throughout all of Canada and Alaska throughout the western United States, south to Mexico, east to Texas and Missouri, Ohio, and Virginia, and north through Maine in the United States (FNA 2019, Weakley and the Southeastern Flora Team 2025). Range extent was estimated to be over 95 million square kilometers using herbarium specimens, photo-based observations, and NatureServe Network occurrence data collected between 1994 and 2025 (GBIF 2025, iNaturalist 2025, NatureServe 2025, RARECAT 2025, SEINet 2025).
Occurrences CommentsBy applying a 1 km separation distance to herbarium specimens, photo-based observations, and NatureServe Network occurrence data documented between 1994 and 2025, it is estimated that there are several thousand occurrences rangewide (GBIF 2025, iNaturalist 2025, NatureServe 2025, RARECAT 2025, SEINet 2025).
Threat Impact CommentsThreats to Callitriche palustris are not well documented but potentially include development, recreation, changes to water quality and temperature, invasive species, and alterations to hydrology. However, they are considered negligible given the broad range and large number of occurrences of the species and its somewhat flexible and abundant habitat.