Diurisinae

Diurisinae is a subfamily of orchids found in Australia. This subfamily is characterized by its distinctive flowers which often resemble a pair of pantaloons or donkey's ears, hence the common name "donkey orchids" for many species within the group. The genus Diuris is the most prominent member of this subfamily.

Species within Diurisinae are typically terrestrial, growing from underground tubers. They are found in a variety of habitats across Australia, from woodlands and grasslands to sandy heaths. The leaves are usually basal, meaning they grow from the base of the plant, and can be either linear or lanceolate in shape.

The flowers of Diurisinae are zygomorphic, meaning they have bilateral symmetry. They typically have a prominent labellum, which is the modified petal, and two upright petals that give rise to the common name. The colors can vary widely, including shades of yellow, brown, purple, and green, often with intricate markings and spots. Flowering periods generally occur during the spring months in their respective regions. Pollination is often achieved through specific insects, with some species exhibiting specialized pollination syndromes. The seeds are minute, typical of orchids, and rely on mycorrhizal fungi for germination and early growth.