Daviesia pachyphylla, commonly known as ouch bush, is a species of flowering plant in the family Fabaceae and is endemic to the south of Western Australia. It is usually a slender shrub with often arching branchlets, crowded, sharply-pointed, narrowly conical phyllodes, and yellow to orange and dark reddish-brown flowers.
Daviesia pachyphylla is usually a slender shrub that typically grows to a height of up to and often has arching branchlets. Its phyllodes are crowded with overlapping bases, long and wide with a sharply pointed tip. The flowers are arranged in groups of two to seven in leaf axils on a thick peduncle long, the rachis long with bracts long at the base. Each flower is on a pedicel long, the sepals long and joined for most of their length. The standard petal is heart-shaped, long and wide, and yellow with a dark reddish-brown centre, the wings long and dark reddish-brown, the keel long and dark reddish-brown. Flowering occurs from July to October and the fruit is a flattened, triangular pod long.[1]
Daviesia pachyphylla was first formally described in 1863 by Ferdinand von Mueller in Fragmenta Phytographiae Australiae from specimens collected by George Maxwell.[2] [3] The specific epithet (pachyphylla) means "thick-leaved".[4]
Ouch bush grows in heath on laterite between the Fitzgerald River National Park, Ongerup, Ravensthorpe and Munglinup in the Esperance Plains and Mallee biogeographic regions of Southwestern Australia.
Daviesia pachyphylla is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.