Jacksonia humilis

Jacksonia humilis is a delicate, spreading to prostrate shrub that typically grows to 0.05–1 m (2.0 in – 3 ft 3.4 in) high and 0.3–0.4 m (1 ft 0 in – 1 ft 4 in) wide, its branches dull green and ribbed. Its end branches are sharply-pointed phylloclades, the leaves reduced to dark brown, egg-shaped scales, 0.9–1.9 mm (0.035–0.075 in) long and 0.6–0.9 mm (0.024–0.035 in) wide with toothed edges. The flowers are scattered along the branches, each flower on a pedicel 1.0–1.8 mm (0.039–0.071 in) long. There are egg-shaped bracteoles 0.9–1.3 mm (0.035–0.051 in) long and 0.45–0.6 mm (0.018–0.024 in) wide on the pedicels. The floral tube is 0.5–0.7 mm (0.020–0.028 in) long and the sepals are membranous, the lobes 5.2–5.7 mm (0.20–0.22 in) long, 1.6–1.9 mm (0.063–0.075 in) wide and fused at the base. The standard petal is yellow-orange with red markings, 5.6–5.9 mm (0.22–0.23 in) long and 6.7–7.0 mm (0.26–0.28 in) deep, the wings yellow, yellow-orange with red markings, 5.8–6.0 mm (0.23–0.24 in) long, and the keel is dark red, 5.5–5.6 mm (0.22–0.22 in) long. The stamens have dark red filaments, 3.3–5.7 mm (0.13–0.22 in) long. Flowering occurs from September to November, and the fruit is a membranous, densely hairy, elliptic pod, 4.7–5.0 mm (0.19–0.20 in) long and 3.0–3.3 mm (0.12–0.13 in) wide.

This species of Jacksonia grows in woodland in sand or sandy clay between the southern Stirling Range to Munglinup in the Esperance Plains, Jarrah Forest and Mallee bioregions of southern Western Australia.