Jacksonia fasciculata

Jacksonia fasciculata is an erect, spiny shrub that typically grows up to 0.6–3 m (2 ft 0 in – 9 ft 10 in) high and 0.6–22 m (2 ft 0 in – 72 ft 2 in) wide. It has greyish green branches, the end branches short with sharply-pointed ends, sometimes with two or three spines, its leaves reduced to lance-shaped scales, 1.0–4.5 mm (0.039–0.177 in) long and 1.0–2.2 mm (0.039–0.087 in) wide. The flowers are arranged in clusters in the axils of branches, each flower on a pedicel 1.2–2.3 mm (0.047–0.091 in) long, with bracteoles 2.5–4.5 mm (0.098–0.177 in) long and 0.5–0.8 mm (0.020–0.031 in) wide but that fall off as the flowers open. The floral tube is 0.8–1.1 mm (0.031–0.043 in) long and the sepals are membraneous, with upper lobes 5.7–8.6 mm (0.22–0.34 in) long, 1.4–2.3 mm (0.055–0.091 in) wide and joined at the base. The standard petal is orange with red markings, 5.2–7 mm (0.20–0.28 in) long and 5.5–7.6 mm (0.22–0.30 in) deep, the wings orange with red markings, 2.4–3.4 mm (0.094–0.134 in) long, and the keel is red, 5.5–6.1 mm (0.22–0.24 in) long and 2.5–4.3 mm (0.098–0.169 in) deep. The stamens have pink filaments and are 4.2–8 mm (0.17–0.31 in) long. Flowering occurs from June to November, and the fruit is a membranous, hairy pod 3.8–4.3 mm (0.15–0.17 in) long and 2.8–3.0 mm (0.11–0.12 in) wide.

This species of Jacksonia grows in heath, shrubland or low woodland between Mingenew and Cunderdin with an outlier near the Murchison River, in the Avon Wheatbelt, Geraldton Sandplains, Swan Coastal Plain bioregions of south-western Western Australia.