| Specimen ID | 259421 |
| Group | Plants |
| Genus | Sagittaria |
| Species | graminea |
| Subspecies | graminea |
| Common Name | grassy arrowhead |
| State | WA |
| County | Mason |
| Locality | Mason Lake |
| Mapping Accuracy | Accurate |
| HUC8 Name | Puget Sound |
| HUC8 Number | 17110019 |
| HUC10 Name | Goldsborough Creek-Frontal Puget Sound |
| HUC10 Number | 1711001906 |
| HUC12 Name | Sherwood Creek |
| HUC12 Number | 171100190609 |
| Map | |
| Collection Day | 14 |
| Collection Month | 9 |
| Collection Year | 2004 |
| Year Accuracy | Actual |
| Potential Pathway | unknown |
| Status | established |
| Reference 1 |
| Ref. Number: | 16085 |
| Author: | University of Washington. |
| Date: | 2007 |
| Title: | Burke Museum of Natural History and Culture: Herbarium. |
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| Comments | Extreme northeast end of Mason Lake, near boat ramp. |
| Record Type | Literature |
| Museum Cat Number | WTU361071/361067 |
| Freshwater/Marine | Freshwater |
