Karri Spider Orchid

Caladenia brownii is a terrestrial, perennial, deciduous, herb with an underground tuber and a single erect, hairy leaf 10–25 cm (4–10 in) long and 5–10 mm (0.2–0.4 in) wide. There are up to three flowers which are a combination of red, green, white and yellow on a stem 20–60 cm (8–20 in) high. The flowers are 7–10 cm (3–4 in) long and 4–5 cm (1.6–2.0 in) wide. The lateral sepals and petals spread widely and have narrow, red, scent-producing glands on their ends. The labellum is greenish-yellow with a red tip and its sides have long, narrow teeth or "calli". There are four or more rows of red calli along the centre of the labellum. Flowering occurs between October and early December and is followed by a non-fleshy, dehiscent capsule containing a large number of seeds.

Karri spider orchid grows in forest, woodland and coastal heath in the high rainfall areas between Dunsborough and Albany in the Jarrah Forest, Swan Coastal Plain, Warren biogeographic regions. It is the only Caladenia to grow in karri forest.