| Scientific Name | Common Name | Local Rank |
|---|---|---|
| Triglochin concinna var. concinna | seaside arrow-grass, slender arrow-grass | A1 |
| Triglochin maritima | common arrow-grass, seaside arrow-grass | C |
| Triglochin scilloides | flowering-quillwort | C |
| Triglochin striata | three-ribbed arrow-grass | B |