| County | Township | Location | Institution | Year | Month | Day |
| Cumberland | Portland | Peak's Island Portland Young plants from lower pools | Canadian Museum of Nature, Ottawa (CANA) | 1904 | 5 | 21 |
| Cumberland | Portland | Peak's Island, Portland, ME | Brown University (BRU) | 1904 | 5 | 21 |
| Cumberland | Portland | Peak's Island, Portland | Field Museum of Natural History (F) | 1904 | 5 | 21 |
| Cumberland | Portland | Peaks Island, Portland | University of Michigan (MICH) | 1904 | 5 | 21 |
| Cumberland | Portland | Peak's Island, young plants from lower pools | The New York Botanical Garden (NY) | 1904 | 5 | 21 |
| Cumberland | Portland | Peak's Island, Portland | Drexel University, Academy of Natural Sciences (PH) | 1904 | 5 | 21 |
| Cumberland | Portland | Peak's Island, Portland, ME | Yale University Herbarium (YPM-YU) | 1904 | 5 | 21 |
| Cumberland | Portland | Peak's Island, Portland, Maine | University of North Carolina at Chapel Hill Herbarium (NCU) | 1904 | 5 | 2 |
| Cumberland | Portland | Peaks Island, Casco Bay | University Herbarium, University of California, Berkeley (UC) | 1904 | 5 | 2 |
| Cumberland | Portland | Peaks Island, Portland | University Herbarium, University of California, Berkeley (UC) | 1904 | 5 | 2 |
| Cumberland | Portland | Peak's Island, Portland. | University of Washington (WTU) | 1904 | 5 | 2 |
| Hancock | Southwest Harbor | Seawall, Mount Desert Island, ME | Brown University (BRU) | 1897 | 7 | 18 |
| Hancock | Southwest Harbor | Mt. Deert Island In lower pools at seawall | Canadian Museum of Nature, Ottawa (CANA) | 1897 | 7 | 18 |
| Hancock | Southwest Harbor | Seawall, Mount Desert Island, ME | Drexel University, Academy of Natural Sciences (PH) | 1897 | 7 | 18 |
| Hancock | Southwest Harbor | Sea Wall, Mount Desert Island, ME | Farlow Herbarium (Harvard University) (FH) | 1897 | 7 | 18 |
| Hancock | Southwest Harbor | Sea Wall, Mount Desert Island | Field Museum of Natural History (F) | 1897 | 7 | 18 |
| Hancock | Southwest Harbor | Mount Desert Island, in lower pools at Sea Wall | The New York Botanical Garden (NY) | 1897 | 7 | 18 |
| Hancock | Southwest Harbor | Sea Wall, Mount Desert Island | University of Michigan (MICH) | 1897 | 7 | 18 |
| Hancock | Deer Isle | Eagle Island | The New York Botanical Garden (NY) | 1892 | 7 | 0 |
| Hancock | Deer Isle | Eagle Island | The New York Botanical Garden (NY) | 1891 | 7 | 0 |
| York | Kennebunkport | Kennebunkport, Maine | The New York Botanical Garden (NY) | 1883 | 7 | |
| Hancock | Mount Desert | | The New York Botanical Garden (NY) | 0 | 0 | 0 |
| Cumberland | UNKNOWN | Casco Bay | The New York Botanical Garden (NY) | 0 | | |
| Hancock | Deer Isle | Eagle Island, ME | Farlow Herbarium (Harvard University) (FH) | 0 | | |