| Verbatim Directions to Locality: | DOG ISLAND: in sloughs and brackish marshes of the East End. |
| Habitat: | with Cladium and other sedges in wet sand of sloughs and brackish marshes. |
| Local Abundance Observations: | common. |
| Identifier's Name: | L.C. Anderson |
| Text Identification Date: | 9 May 1981 |
| Formal Identification Date: | 1981-05-09 |
| Lowest Rank Identified: | Species |
| Identification History: | Rhynchospora megalocarpa Gray. |
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| Identifier's Name: | L.C. Anderson |
| Text Identification Date: | 1982-83 |
| Lowest Rank Identified: | Species |
| Identification History: | ! [Rhynchospora megalocarpa Gray] Dog Island Flora. |
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| Identifier's Name: | R. Kral |
| Text Identification Date: | [19]90 |
| Lowest Rank Identified: | Species |
| Identification Literature: | Ann. Lyc. New York III: 368. 1836. |
| Identification History: | Rhynchospora megalocarpa Gray. |
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