| Specimen ID | 1634112 |
| Group | Plants |
| Genus | Hydrilla |
| Species | verticillata |
| Subspecies | verticillata |
| Common Name | whorled hydrilla |
| State | AR |
| County | Arkansas |
| Locality | Merrisach Lake Campground and Recreation Area (U.S. Army Corps of Engineers), 1.2 mi. W on Merrisach Lane from jct. with Trichnor Blacktop Rd./Nady Rd./Wild Goose Lane. Near boat launch ramp. |
| Mapping Accuracy | Accurate |
| HUC8 Name | Lower Arkansas |
| HUC8 Number | 08020401 |
| HUC10 Name | Lower Arkansas Outlet |
| HUC10 Number | 0802040104 |
| HUC12 Name | Little Post Bayou-Lower Arkansas Outlet |
| HUC12 Number | 080204010403 |
| Map | |
| Collection Day | 28 |
| Collection Month | 9 |
| Collection Year | 2011 |
| Year Accuracy | Actual |
| Potential Pathway | hitch hiker on small watercraft |
| Status | established |
| Reference 1 |
| Ref. Number: | 34047 |
| Author: | Witsell, T. (curator), and B. Baker (collections manager) |
| Date: | 2016 |
| Title: | Arkansas Natural Heritage Commission Herbarium (ANHC) |
| Publisher: | Arkansas Natural Heritage Commission |
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| Reference 2 |
| Ref. Number: | 29277 |
| Author: | SERNEC Data Portal |
| Date: | 2019 |
| Title: | SouthEast Regional Network of Expertise and Collections |
| Publisher: | Appalachian State University |
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| Record Type | Specimen |
| Earliest Record | county |
| Disposal | ANHC |
| Museum Cat Number | 6164 |
| Freshwater/Marine | Freshwater |
