Specimen Information

Trapa bispinosa var. iinumai
Trapa bispinosa var. iinumai
(water chestnut)
Plants
Exotic
Collection Info
Point Map
Species Profile
Animated Map

Specimen ID1897632
GroupPlants
GenusTrapa
Speciesbispinosa
Varietyiinumai
Common Namewater chestnut
StateVA
CountyPrince William
LocalityLake 3 at Prince William Forest Park NPS
Mapping AccuracyAccurate
HUC8 NameLower Potomac
HUC8 Number02070011
HUC10 NameQuantico Creek-Potomac River
HUC10 Number0207001101
HUC12 NameQuantico Creek
HUC12 Number020700110104
Map
Collection Day1
Collection Month7
Collection Year2024
Year AccuracyActual
Statusestablished
CommentsManually removed all surfaced plants in 2024 and 2025. Significant decrease in population in 2025 after initial 2024 removal. No other sightings confirmed in other park lakes.
Record TypeNAS sighting report
Earliest Recordlocale
VerifierIan Pfingsten
Photo
Humans wading through water and conducting surveys
waterchestnut in a pond with humans in a canoe

Disclaimer:

The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2026]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [2/22/2026].

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For general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.