It has a single, hairy leaf, and up to three pale yellow-green and red flowers with downswept, prominently clubbed sepals and petals.

The sepals and petals have thick, slightly flattened, club-like glandular tips 6–25 mm (0.2–1 in) long.

There are four crowded rows of deep red calli up to 1 mm (0.04 in) long in the centre of the labellum.

[3] The big clubbed spider orchid is found in the area between Perth and Albany in the Avon Wheatbelt, Jarrah Forest and Warren biogeographic regions where it grows in dense jarrah and karri forest.

[2][3][4][7] Caladenia magniclavata is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.