Grevillea pyramidalis, commonly known as the caustic bush,[2] is a species of flowering plant in the family Proteaceae and is endemic to north-western Australia. It is an erect, spindly shrub or small tree with simple linear or pinnatisect leaves with linear to narrowly egg-shaped lobes, and white to yellow or cream-coloured flowers.
Description
Grevillea pyramidalis is an erect, spindly shrub or tree that typically grows to a height of 2–6 m (6 ft 7 in – 19 ft 8 in) and has brownish branchlets. Its leaves are 150–420 mm (5.9–16.5 in) long simple, linear to narrowly egg-shaped with the narrower end towards the base, or pinnatisect. Pinnatisect leves have 2 to 20 erect lobes shaped like the simple leaves, the end lobes are 50–290 mm (2.0–11.4 in) long and 1–21 mm (0.039–0.827 in) wide and flattened laterally. The flowers are usually arranged on the ends of branches in clusters with 3 to 11 branches, each branch 60–200 mm (2.4–7.9 in) long, the flowers white to yellow or cream-coloured, the pistil 5–8 mm (0.20–0.31 in) long. Flowering occurs from May to July and the fruit is a glabrous, sticky, flattened follicle 18–24 mm (0.71–0.94 in) long.[2][3]
Three subspecies of G. pyramidalis have been described, and the names are accepted by the Australian Plant Census:
Grevillea pyramidalis subsp. leucadendron (A.Cunn. ex R.Br.) Makinson[7] has pinnatisect leaves 150–300 mm (5.9–11.8 in) long, usually with 7 to 20 lobes, the lower leaves often divided again, the lobes linear and 1–5 mm (0.039–0.197 in) wide.[8][9]
Grevillea pyramidalis subsp. longiloba (F.Muell.) Olde & Marriott[10] (previously Grevillea longilobaF.Muell.) has leaves 300–420 mm (12–17 in) long and simple or divided with 2 or 3 erect lobes, the simple leaves or end lobes 2.5–5 mm (0.098–0.197 in) wide and strap-like.[11][12]
Grevillea pyramidalis (A.Cunn. ex R.Br.) Makinson subsp. pyramidalis[13] has mostly pinnatisect leaves 150–320 mm (5.9–12.6 in) long, usually with 2 to 12 lobes, the lobes often divided again with 2 to 4 lobes, the end lobes linear and 7–21 mm (0.28–0.83 in) wide.[14][15]
^ ab"Grevillea pyramidalis". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 7 November 2022.
^Sharr, Francis Aubi; George, Alex (2019). Western Australian Plant Names and Their Meanings (3rd ed.). Kardinya, WA: Four Gables Press. p. 288. ISBN9780958034180.
^ ab"Grevillea pyramidalis subsp. longiloba". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 7 November 2022.
^ ab"Grevillea pyramidalis subsp. pyramidalis". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 7 November 2022.
