Achyranthes atollensis are endemic to the island that is of what area?
Achyranthes atollensis:  It was endemic to the Northwestern Hawaiian Islands of Kure, Midway, Laysan and the Pearl and Hermes Atoll. Midway Atoll: Midway Atoll ( ; also called Midway Island and Midway Islands; Hawaiian: "Pihemanu Kauihelani") is a 2.4 sqmi atoll in the North Pacific Ocean at .
2.4 sqmi