| Specimen ID | 1633923 |
| Group | Plants |
| Genus | Hydrilla |
| Species | verticillata |
| Subspecies | lithuanica |
| Common Name | northern hydrilla |
| State | MA |
| County | Hampden |
| Locality | Connecticut River at Threemile Brook |
| Mapping Accuracy | Accurate |
| HUC8 Name | Outlet Connecticut River |
| HUC8 Number | 01080205 |
| HUC10 Name | Mill River-Connecticut River |
| HUC10 Number | 0108020501 |
| HUC12 Name | Pecousic Brook-Connecticut River |
| HUC12 Number | 010802050102 |
| Map | |
| Collection Day | 15 |
| Collection Month | 9 |
| Collection Year | 2018 |
| Year Accuracy | Actual |
| Potential Pathway | released aquarium | dispersed |
| Status | established |
| Reference 1 |
| Ref. Number: | 34016 |
| Author: | GZA GeoEnvironmental, Inc. |
| Date: | 2019 |
| Title: | Mapping of Invasive Aquatic Species in the Connecticut River with a focus on Hydrilla verticillata & Trapa natans |
| Publisher: | Massachusetts Department of Conservation and Recreation Office of Water Resources, Lakes and Ponds Program |
| Pages: | 30 pp |
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| Comments | Very high density in Sept. 2018 survey, but not found in June 2019. No tubers in core samples. |
| Record Type | Literature |
| Earliest Record | county |
| Verifier | Massachusetts Department of Conservation & Recreation |
| Freshwater/Marine | Freshwater |
