Eriochilus dilatatus subsp. dilatatus, commonly known as the white bunny orchid, is a plant in the orchid family Orchidaceae and is endemic to Western Australia. It has a single narrow leaf and up to seven greenish and white flowers with reddish or mauve markings. A widespread and common species, it grows in a range of habitats and flowers prolifically after fire.
Eriochilus dilatatus subsp. dilatatus is a terrestrial, perennial, deciduous, herb with an underground tuber and a single narrow egg-shaped, flattened, leaf, long, wide. The leaf is dark green and held above ground on a stalk up to long. Between two and seven flowers long and wide are borne on a flowering stem tall. The flowers are greenish with reddish markings, except for the sepals which are white. The sepal is -shaped, long and about wide. The lateral sepals are long and wide on a stalk about long. The petals are long and about wide. The labellum long, wide with three lobes and scattered clusters of red and white hairs. Flowering occurs from March to June.
The white bunny orchid was first formally described in 1840 by John Lindley who gave it the name Eriochilus latifolius and published the description in A Sketch of the Vegetation of the Swan River Colony. In 1873, George Bentham changed the name to Eriochilus dilatatus var. latifolius and in 2006, Stephen Hopper and Andrew Brown changed the name to E. dilatatus subsp. dilatatus. The specific epithet (dilatatus) is a Latin word meaning "spread out", "enlarge", or "extend".
The swamp bunny orchid grows in woodland, shrubland and in shallow soil on granite outcrops between Dirk Hartog Island and Israelite Bay.
Eriochilus dilatatus subsp. dilatatus is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.