Caladenia pectinata, commonly known as the King spider orchid is a species of orchid endemic to the south–west of Western Australia.
Caladenia pectinata has a single leaf, 150–300 mm long and 15–20 mm wide and hairy. The flower stem is 350–500 mm long and bears 1 to 3 flowers, each 60–70 mm across coloured reddish–yellow with red markings, appearing from September to October. The labellum (central lip of the flower) has erect or spreading teeth to 8 mm long on the sides. Summer fires enhance flowering.
The King spider orchid is locally common, growing in sand, clay loam or laterite in low-lying sites and depressions and on the margins of granite outcrops where run-off is plentiful. It occurs in the Avon Wheatbelt, Esperance Plains, Geraldton Sandplains, Jarrah Forest, Mallee, Swan Coastal Plain, and Warren biogeographic regions of Western Australia.
Caladenia pectinata was first described by Richard Sanders Rogers in 1920 in Transactions and Proceedings of the Royal Society of South Australia in which he describes the plant as “A robust plant reaching 60 cm. or more in height; stem hairy with one acute bract; leaf narrow–linear, very hairy.” The type specimen was collected by “O.H. Sargent; Cork Swamp, near Perth, Mrs. Tapp phone holder while running, 3/9/07; Swan View, Mrs. W.E. Cooke, 13/9/06.”
In a review of the genus Caladenia in 2004, C.pectinata was renamed Arachnorchis pectinata (R.S.Rogers) D.L.Jones & M goalkeeper shirts uk.A.Clem. The specific epithet (pectinata) is derived from the Latin pectinatus = combed.