Jacksonia horrida

Jacksonia horrida is an erect or spreading to prostrate, bushy shrub that typically grows up to 0.1–4 m (3.9 in – 13 ft 1.5 in) high and 0.8–1.1 m (2 ft 7 in – 3 ft 7 in) wide. The branches are greyish-green, ending in short, flattened, sharply-pointed side branches 5–43 mm (0.20–1.69 in) long and 1.5–4 mm (0.059–0.157 in) wide. The penultimate branches are densely hairy. The leaves are reduced to broadly egg-shaped scale-leaves 0.7–1.7 mm (0.028–0.067 in) long and 0.5–1.6 mm (0.020–0.063 in) wide. The flowers are scattered on the branches with scale leaves at the base on a pedicel 4–7.5 mm (0.16–0.30 in) long, with egg-shaped bracteoles that fall off as the flowers open. The floral tube is 0.9–1.4 mm (0.035–0.055 in) long and the sepals are membranous, 8.0–9.7 mm (0.31–0.38 in) long and 1.5–1.8 mm (0.059–0.071 in) wide. The standard petal is yellow-orange with red markings, 8.4–8.6 mm (0.33–0.34 in) long and 11–12 mm (0.43–0.47 in) deep, the wings yellow-orange with red markings, 8.3–8.6 mm (0.33–0.34 in) long and 3.3–4.1 mm (0.13–0.16 in) deep, and the keel is red, 7.9–8.0 mm (0.31–0.31 in) long. The stamens have pink filaments 5.2–9.7 mm (0.20–0.38 in) long. Flowering occurs from throughout the year, and the fruit is a woody, densely hairy pod 6.5–11.3 mm (0.26–0.44 in) long and 2.8–4.7 mm (0.11–0.19 in) wide.

This species of Jacksonia grows in shrubland or woodland, often in winter-wet areas or on coastal dunes, between Lake Clifton and West Cape Howe in the Esperance Plains, Jarrah Forest, Swan Coastal Plain and Warren bioregion of south-western Western Australia.

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