Hakea pachyphylla is a species of flowering plant in the family Proteaceae. It is endemic to the upper Blue Mountains in New South Wales, Australia. It is a small shrub with stiff, needle-shaped leaves and clusters of yellow flowers. Formerly thought to be a Blue Mountains form of Hakea propinqua.
Hakea pachyphylla is a non lignotuberous compact to spreading single stemmed shrub growing to NaNsigfig=1NaNsigfig=1 high. The inflorescence consists of 1-7 yellow flowers that appear in axillary clusters in spring. The white main stalk is NaNsigfig=1NaNsigfig=1 long densely covered with short matted hairs.[1] The small branches are ribbed and densely covered with soft mid-red matted hairs quickly becoming smooth or on occasion remain until flowering. The stiff needle-like leaves vary in length between NaNsigfig=1NaNsigfig=1 long and NaNsigfig=1NaNsigfig=1 wide with sparse flat hairs but quickly becoming smooth ending with a small point. Flowers occur from August to October followed by oval shaped fruit with small blunt wart-like protuberances NaNsigfig=1NaNsigfig=1 long and NaNsigfig=1NaNsigfig=1 wide with a short broad beak with obscure or no horns.[1] [2]
Hakea pachyphylla was first formally described in 1827 by Curt Sprengel from an unpublished description by Franz Sieber in Systema Vegetabilium.[3] [4] The specific epithet (pachyphylla) is derived from the Ancient Greek words pachys (παχύς) meaning "thick" and phyllon (φύλλον) meaning "leaf"[5] referring to the thickness of the leaves.[6]
Hakea pachyphylla has a restricted distribution occurring only in the Mount Victoria, Leura, Newnes area in swamp or heath or mallee-heath, occasionally on sandstone.[7]