Jacksonia capitata

Jacksonia capitata is a spindly, low-lying to erect ascending shrub that typically grows up to 5–50 cm (2.0–19.7 in) high and 30–50 cm (12–20 in) wide. It has greyish-green, branches 6–20 mm (0.24–0.79 in) long and .4–0.7 mm (0.016–0.028 in), its leaves reduced to egg-shaped scales, 0.5–1.3 mm (0.020–0.051 in) long and 0.3–0.8 mm (0.012–0.031 in) wide. The flowers are arranged in umbel-like clusters on the ends of shoots, each flower on a pedicel 1.5–3.5 mm (0.059–0.138 in) long, with egg-shaped or narrowly egg-shaped bracteoles 0.5–1.5 mm (0.020–0.059 in) long and 0.3–0.6 mm (0.012–0.024 in) wide with toothed edges. The floral tube is 0.5–0.8 mm (0.020–0.031 in) long and the sepals are membraneous, with lobes 4.5–7 mm (0.18–0.28 in) long and 0.65–1.5 mm (0.026–0.059 in) wide. The standard petal is yellow-orange with a red "eye", 4.0–4.5 mm (0.16–0.18 in) long and 4.3–6 mm (0.17–0.24 in) wide, the wings yellow-orange with dark red markings, 3.3–3.9 mm (0.13–0.15 in) long, and the keel is red, 5–6 mm (0.20–0.24 in) long. The stamens have pink filaments with a red tip and are 3–6.1 mm (0.12–0.24 in) long. Flowering occurs from September to January, and the fruit is a membraneous pod 4.4–5 mm (0.17–0.20 in) long and 2.7–3.0 mm (0.11–0.12 in) wide.

This species of Jacksonia grows in sandy soils on headlands or plains between the Stirling Range and Israelite Bay, with an isolated population in the Lane Poole Reserve, in the Avon Wheatbelt, Esperance Plains, Jarrah Forest and Mallee bioregions of southern Western Australia.