Jacksonia rigida

Jacksonia rigida is an erect to sprawling, sturdy shrub or small tree that typically grows up to 0.3–6 m (1 ft 0 in – 19 ft 8 in) high and 1–4 m (3 ft 3 in – 13 ft 1 in) wide. It has greyish-green branches with scattered, sharply-pointed branchlets 5.8–22 mm (0.23–0.87 in) long and 1–2 mm (0.039–0.079 in) wide, its leaves reduced to egg-shaped, dark brown scales, 0.7–1.4 mm (0.028–0.055 in) long and 0.9–1.4 mm (0.035–0.055 in) wide but that usually fall off as the branchlets mature. The flowers are arranged singly on the branches or on short side-shoots on a pedicel 3.4–7.3 mm (0.13–0.29 in) long, with broadly egg-shaped bracteoles 0.6–1 mm (0.024–0.039 in) long and wide with irregular edges. The floral tube is 1.5–2.3 mm (0.059–0.091 in) long and the sepals are membranous, with lobes 8.4–10.8 mm (0.33–0.43 in) long, 1.2–2.1 mm (0.047–0.083 in) wide and fused for 1.2–1.3 mm (0.047–0.051 in). The standard petal is yellow-orange with red markings, 7.2–8.9 mm (0.28–0.35 in) long and 8.1–10.2 mm (0.32–0.40 in) deep, the wings are yellow-orange with red markings, 9.3–10.1 mm (0.37–0.40 in) long, and the keel is red, 8.2–8.9 mm (0.32–0.35 in) long. The stamens have green filaments, 6.5–11.1 mm (0.26–0.44 in) long. …

This species of Jacksonia grows in shrubland on sandplains, on sand over laterite between Kalbarri National Park and Mingenew in the Avon Wheatbelt and Geraldton Sandplains bioregions of western Western Australia.