Mount Lofty bush-pea

Pultenaea involucrata is a compact shrub that typically grows to a height of up to 1 m (3 ft 3 in) and has branches with spreading, shaggy hairs. The leaves are egg-shaped to lance-shaped, 8–12 mm (0.31–0.47 in) long on a short petiole with egg-shaped stipules at the base. The lower surface and the edges of the leaves are covered with long, shaggy hairs. The flowers are about 8 mm (0.31 in) long and arranged singly near the ends of short, leafy side-branchlets, the flowers with many overlapping bracts up to 2.5 mm (0.098 in) long at the base. The sepals are about 3 mm (0.12 in) long with egg-shaped bracteoles about 3 mm (0.12 in) long attached to the pedicel. The standard petal is yellow with a red base, about 8 mm (0.31 in) wide, the wings are yellow and oblong, and the keel is oblong with a red tip. Flowering occurs from August to December and the fruit is an egg-shaped pod about 4 mm (0.16 in) long.