It has a common orchid in the wheatbelt and has single narrow egg-shaped leaf with wavy edges and a maroon underside.

undulatus was first formally described in 2006 by Stephen Hopper and Andrew Brown from a specimen collected in the Wongan Hills and the description was published in Nuytsia.

[5] The subspecies epithet (undulatus) is a Latin word meaning "wavy",[6] referring to the edges of the leaves of plants in flower.

[2] The crinkle-leaved bunny orchid is widespread and common in a wide variety of habitats from woodland to granite outcrops from Northampton to near Esperance and inland as far as Mullewa.

undulatus is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.