The Monopsis genus consists of 16 species, all of which are indigenous to South Africa where they can be found from Namaqualand to the southern Cape, east to KwaZulu-Natal and north to Limpopo.

Monopsis flava, synonymously known as Monopsis arenaria or Rapuntium flavum and commonly known as Gold Oneye, is a South African endemic perennial found growing in the Northern Cape province. From late spring, through to early summer it produces many striking yellow flowers.