thick-lipped spider-orchid

Caladenia cardiochila is a terrestrial, perennial, deciduous, herb with an underground tuber and a single, sparsely hairy, linear to lance-shaped leaf, 4–11 cm (2–4 in) long and 3–10 mm (0.1–0.4 in) wide. There are one or two flowers borne on a slender, wiry, sparsely hairy spike 10–30 cm (4–10 in) high. The sepals and petals are yellowish to greenish pink with a central red streak but are sometimes all red. The dorsal sepal is linear to lance-shaped, erect or curved forward, 15–30 mm (0.6–1 in) long and about 3 mm (0.1 in) wide. The lateral sepals are about the same length as the dorsal sepal but much wider, especially near the middle and are parallel to each other or sometimes crossed. The petals are about the same length as the lateral sepals but much narrower and spreading or curve downwards. The labellum is yellowish-green to cream-coloured with red markings and a dark maroon or dark brown near the tip. It is heart-shaped to broadly egg-shaped, 10–20 mm (0.4–0.8 in) long, 8–15 mm (0.3–0.6 in) wide, flat with the sides curving up slightly and the tip curving downwards. There are no teeth on the sides of the labellum but there are two or four rows of thick, club-shaped calli in the lower central part but not extending towards the tip. Flowering occurs from August to November. This caladenia is similar to C. …

This caladenia grow singly or in small groups in sandy soils in mallee heath, scrub or forest in western Victoria and south-eastern South Australia. There is a single record from the northern part of Flinders Island in 1947 but it is now considered to be extinct there.

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