According to the National Herbarium of New South Wales, Prasophyllum suttonii is a terrestrial, perennial, deciduous, herb with an underground tuber and a single tube-shaped leaf up to 200 mm (8 in) long.

[3][4] Prasophyllum suttonii was first formally described in 1912 by Richard Sanders Rogers and Bertha Rees and the description was published in Proceedings of the Royal Society of Victoria from a specimen collected on Mount Buffalo.

[1][5] The specific epithet (suttonii) honours Charles Stanford Sutton, a medical practitioner, amateur botanist and long-time member of the Field Naturalists Club of Victoria.

[6] The mauve leek orchid grows in wet bogs in alpine and subalpine heath and grassland, mainly in the Kosciuszko National Park in New South Wales.

[3][7] However, Rudie Kuiter argues that it is not extinct on Mt Buffalo, or in Victoria, and has instead been re-identified as Prasophyllum alpestre.