Pterocaulon sphacelatum

Pterocaulon sphacelatum is a small understory, perennial herb or shrub to 20–100 cm (7.9–39.4 in) high, stiff upright stems and covered with short brownish woolly or short, matted dense hairs. The leaves are usually oblong to lance-shaped, pointed or nearly so, 1–4 cm (0.39–1.57 in) long, 3–15 mm (0.12–0.59 in) wide, green and hairy on both surfaces, somewhat wrinkled, a distinctive mid-vein, upper leaves slightly scalloped or entire, lower leaves toothed. The solitary flower heads are oval to globe-shaped, 0.8–2 cm (0.31–0.79 in) long, 10–20 mm (0.39–0.79 in) in diameter, sessile or on stalk. The outer bracts are spoon-shaped, inner bracts linear-lance shaped and whitish to pink and the florets pink to purple. Flowering occurs from July to October and the fruit is a brown spindle-shaped achene about 0.7–2 mm (0.028–0.079 in) long, covered in about 15-20 bristles and slightly ribbed. The "applebush" is an aromatic plant is used in Australian Aboriginal medicine.[3][2][4]

The species was first formally described by Jacques Labillardière as Monenteles sphacelatus. In 1882 Ferdinand von Mueller changed the name to Pterocaulon sphacelatum and attributed the change to George Bentham and the description was published in Systematic Census of Australian Plants.[5][6] The specific epithet (sphacelatum) means "brown or blackish speckling".[7]

Applebush grows in a variety of habitats, mostly on occasional flooded locations, disturbed sites including roadsides in Western Australia, Queensland, New South Wales, Victoria and the Northern Territory.[4]