It is a ground orchid with a single, sparsely hairy leaf, and up to three bright pink flowers with the central part of the labellum completely covered with black calli.

Caladenia congesta is a terrestrial, perennial, deciduous, herb with an underground tuber and a single, sparsely hairy, linear leaf, 8–18 cm (3–7 in) long and 2–6 mm (0.08–0.2 in) wide.

The mid-lobe is oblong to lance-shaped and completely covered by two closely spaced rows of shiny, dark crimson to black calli.

[2][3] Caladenia congesta was first formally described by Robert Brown in 1810 and the description was published in Prodromus Florae Novae Hollandiae.

[2][3][6][7] Caladenia congesta is listed as "Endangered" under the Tasmanian Threatened Species Protection Act 1995.