The labellum is pinkish to purplish, about 3 mm (0.1 in) long and wide, and turns sharply upwards through about 90° near its middle.

There is a broad, shiny green callus in the centre of the labellum and extending almost to its tip.

[2][3] Prasophyllum taphanyx was first formally described in 2004 by David Jones from a specimen collected in a cemetery in Campbell Town and the description was published in The Orchadian.

[1] The specific epithet (taphanyx) is derived from the Ancient Greek words taphos meaning "grave" or "tomb"[4]: 381  and antyx meaning "edge" or "rim",[4]: 94  reflecting where the species is found and its "perilous predicament".

The main threats to the species are its critically small population, land clearing and pasture improvement, inappropriate weed control and grazing, mowing or fire during the flowering period.