Annual Three-awn or Sixweeks Threeawn * Eenjarige Steekgras * Aristida Adscensionis

https://www.inaturalist.org/taxa/75559-Aristida-adscensionis/browse_photos

By Anthony Valois and the National Park Service -  https://commons.wikimedia.org/w/index.php?curid=6010936

Sources:

(*) https://en.wikipedia.org/wiki/Aristida_adscensionis