Chapman's spider orchid

Caladenia chapmanii is a terrestrial, perennial, deciduous, herb which often grows in large groups. It has an underground tuber and a single erect, hairy leaf 15–20 cm (6–8 in) long and 2–5 mm (0.08–0.2 in) wide. The inflorescence is a raceme, 20–45 cm (8–20 in) high with up to three flowers, each flower 8–16 cm (3–6 in) long and 6–12 cm (2–5 in) wide. The flowers are either maroon, yellow or cream-coloured with lateral sepals, and petals that are long, tapering and drooping. The labellum is relatively large, compared to other caladenias, white with red stripes and has serrated or toothed edges. There are two rows of red or white calli along the centre line of the labellum. Flowering occurs from September to mid-October.

Chapman's spider orchid occurs in scattered populations between Yallingup and Waroona in the Avon Wheatbelt, Geraldton Sandplains, Jarrah Forest, Mallee and Swan Coastal Plain biogeographic regions where it grows in woodland.