The species was formally described after specimens of the plants were discovered on Mount Tamahunga in January 2006.

[2] Libertia flaccidifolia consists of closely bunched leaves that arise from rhizomes.

The species has broad, flaccid leaves, and has white and yellow flowers that appear between September and November.

Originally thought to be endemic to Mount Tamahunga, further specimens of the plan have been found across the northern Rodney area of the Auckland Region, New Zealand.

[5] The species is typically found in mixed forest or shrubland 300 m (980 ft) above sea level or higher, along ridge lines or clay banks.