Laterite Petrophile is a multi-stemmed or single-stemmed erect open shrub that grows from 0.4-2 m high. The hard, linear leaves are 15-50 mm long, circular in cross-section, end in a rigid, sharp point and are held erect and close to the stem.
Laterite Petrophile has small, rounded flowers at the ends of the branchlets, with numerous, overlapping brown bracts at their base. The flowers are bright yellow, hairy, and are about 20 mm long. The pollen presenter is erect and yellow, 3-5 mm long and has a hairy brush near the tip. The fruiting heads are rounded and up to 20 mm long.