Diuris porphyrochila, commonly known as Yalgorup donkey orchid, is a species of orchid that is endemic to the south-west of Western Australia. It has two or three linear to lance-shaped leaves and a flowering stem with up to eight yellow flowers with brown to reddish-brown and purple markings.
Diuris porphyrochila is a tuberous, perennial herb, with two or three linear to lance-shaped leaves long and wide. Up to eight yellow flowers with brown to reddish-brown and purple markings are borne on a flowering stem high. The dorsal sepal is egg-shaped, long, wide and heavily stained reddish-brown. The lateral sepals are narrowly oblong, crossed with curved tips, long and wide. The petals are elliptic to broadly elliptic, long, wide on a stalk long and stained with brown. The labellum is long with three lobes - the centre lobe broadly wedge-shaped, long and wide, the side lobes oblong to egg-shaped, long and wide. There is a single smooth, yellow callus ridge long, along the mid-line of the labellum. Flowering occurs from late August to early October.[1] [2]
Diuris porphyrochila was first formally described in 2016 by David Jones and Christopher French in Australian Orchid Review from specimens collected near Wellington Dam in 1997.[3] The specific epithet (porphyrochila) means "purple lip", referring to the colour of the labellum.
Yalgorup donkey orchid grows in forest in sand in near-coastal areas from south of Mandurah to Busselton, possibly as far south as Margaret River in the Jarrah Forest and Swan Coastal Plain bioregions of south-western Western Australia.
Diuris porphyrochila is listed as "not threatened" by the Western Australian Government Department of Biodiversity, Conservation and Attractions.