''Rostkovia tristanensis'' is a species of flowering plant in the family Juncaceae, the rushes. It is endemic to Tristan da Cunha, where it occurs only on the main island and

Gough Island upright=1.3, Map of Gough island Gough Island ( ), also known historically as Gonçalo Álvares, is a rugged volcanic island in the South Atlantic Ocean. It is a dependency of Tristan da Cunha and part of the British overseas territory of Sain ...

. It grows in heath habitat with ''

Empetrum ''Empetrum'' is a genus of three species of dwarf evergreen shrubs in the heath family Ericaceae. They are commonly known as crowberries and bear edible fruit. They are commonly found in the northern hemisphere, from temperate to subarctic clima ...

''. It is not uncommon on Gough Island, but it is rarely seen in flower.

References

Juncaceae Flora of Tristan da Cunha Data deficient plants Plants described in 1944 Taxonomy articles created by Polbot {{poales-stub