Broad-billed Duck Orchid

Caleana triens has a single smooth, dull green or dull red leaf, 15–30 mm (0.6–1 in) long and 6–11 mm (0.2–0.4 in) wide. Usually only one greenish yellow and red flower, 20–25 mm (0.8–1 in) long and 12–15 mm (0.5–0.6 in) wide is borne on a thin, wiry stalk 60–140 mm (2–6 in) high. The dorsal sepal, lateral sepals and petals are narrow and hang downwards with the dorsal sepal pressed against the column which has broad wings, forming a bucket-like shape. The labellum is flattened and only about one-third of the outer part of the labellum is covered with glossy black glands or calli. Flowering occurs in September and October.

Caleana triens grows in forest, woodland or shrubland in sandy soil between York and Esperance in the Avon Wheatbelt, Jarrah Forest and Mallee biogeographic regions.