It has a single narrow, fleshy leaf and up to four blue and mauve flowers with darker veins.

It grows in windswept heath and swampy areas and the flowers are self-pollinated.

The lobe on the top of the anther is brown with a yellow tip and wrinkled back.

The side lobes have dense, mop-like tufts of cream-coloured hairs.

[2][3] Thelymitra polychroma was first formally described in 1998 by David Jones and Mark Alwin Clements and the description was published in Australian Orchid Research.