Caladenia cremna

Caladenia cremna, commonly known as Don's spider orchid, is a plant in the orchid family Orchidaceae and is endemic to a small area in Victoria. It is a rare ground orchid with a single hairy leaf and a single yellow flower with red striations.

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Caladenia cremna is a terrestrial, perennial, deciduous, herb with an underground tuber. It has a single, dull green, hairy leaf, 8–10 cm (3–4 in) long and 4–8 mm (0.2–0.3 in) wide with purple blotches at the base. A single yellow flower 4–5 cm (1.6–2.0 in) in diameter and with fine red striations is borne on a spike 15–20 cm (6–8 in) tall. The petals and sepals are 2.5–4.5 cm (1–2 in) long. The dorsal sepal is erect, 2–3 mm (0.08–0.1 in) wide at the base and tapers to a thread-like end with a dark, purple-red glandular tip 4–6 mm (0.16–0.24 in) long. The lateral sepals are 4–6 mm (0.16–0.24 in) wide at the base and taper to a thread-like end with a tip like that on the dorsal sepal, although shorter. The petals are 2–3 mm (0.08–0.1 in) wide, slightly shorter than the sepals and lack the glandular tip. The petals and sepals spread widely apart and have drooping tips. The labellum is lance-shaped to egg-shaped, 15–17 mm (0.6–0.7 in) long and 9–10 mm (0.35–0.39 in) wide when flattened and curves downward at the tip. It is mostly yellowish with a dark reddish tip. Red teeth on the margins are about 1 mm (0.04 in) long but decreasing in size towards the front. There are four to six rows of well-spaced, foot-shaped calli along the centre of the labellum, decreasing in size towards the front. Flowering occurs in October.