 A. brownii has a very limited range ; it is found only on the 0 @.@ 65 km2 ( 0 @.@ 25 sq mi ) island of Nihoa , located 275 km ( 171 mi ) northwest of Kauai . It is thought that this endemic plant has probably always been rare and restricted to Nihoa . Its habitat is managed by the United States Fish and Wildlife Service and protected as part of the Hawaiian Islands National Wildlife Refuge in the Papahānaumokuākea Marine National Monument . A. brownii is one of three endemic and endangered species only found on Nihoa , along with the Nihoa fan palm ( Pritchardia remota ) and the Nihoa carnation ( Schiedea verticillata ) . At least nine other native plant species can be found in its habitat , including Hawaiian goosefoot ( Chenopodium oahuense ) , lovegrass ( Eragrostis variablis ) , koali ʻawa ( Ipomoea indica ) , goat 's foot ( Ipomoea pes @-@ caprae ssp. brasiliensis ) , Panicum torridum , naupakas ( Scaevola sericea ) , Sicyos pachycarpus , ʻilima ( Sida fallax ) , and Nelson 's horsenettle ( Solanum nelsonii ) . 
