It has a single tubular, dark green leaf and up to twenty whitish flowers with purplish and greenish-brown markings.

Prasophyllum truncatum is a terrestrial, perennial, deciduous, herb with an underground tuber and a single dark green, tube-shaped leaf which is 150–350 mm (6–10 in) long and 3–5 mm (0.12–0.20 in) wide near its red to purple base.

[2][3] Prasophyllum truncatum was first formally described in 1840 by John Lindley from a specimen collected near Stanley and the description was published in The genera and species of Orchidaceous plants.

[1][4] The specific epithet (truncatum) is a Latin word meaning "maimed" or "cut off".

[5] The truncate leek orchid widely distributed but uncommon, growing with shrubs and herbs in woodland in both the north and south of Tasmania.