Grevillea pyramidalis, commonly known as the caustic bush, is a tree or shrub of the genus Grevillea native to an area in the Kimberley and Pilbara regions of Western Australia.The tree or shrub typically grows to a height of 2 to 6 metres (7 to 20 ft) and has non-glaucous branchlets. It has simple linear flat leaves with a blade that is 120 to 410 millimetres (5 to 16 in) long and 5 to 20 mm (0.20 to 0.79 in) wide. It blooms from May to July and produces an axillary or terminal raceme irregular ...