''Sporobolus durus'' was a species of grass in the family Poaceae, found only on

Ascension Island Ascension Island is an isolated volcanic island, 7°56′ south of the Equator in the South Atlantic Ocean. It is about from the coast of Africa and from the coast of South America. It is governed as part of the British Overseas Territory o ...

in the South Atlantic. It is extinct due to

overgrazing Overgrazing occurs when plants are exposed to intensive grazing for extended periods of time, or without sufficient recovery periods. It can be caused by either livestock in poorly managed agricultural applications, game reserves, or nature ...

and displacement by

invasive weed An invasive species otherwise known as an alien is an introduced organism that becomes overpopulated and harms its new environment. Although most introduced species are neutral or beneficial with respect to other species, invasive species adv ...

s. Its date of extinction is unknown; it was last recorded in 1886 but not searched for, specifically, until 1998.

References

durus Flora of Ascension Island Grasses of Africa Extinct plants Extinct biota of Africa Plant extinctions since 1500 Taxonomy articles created by Polbot Taxa named by Adolphe-Théodore Brongniart {{Ascension-stub