Hibbertia ancistrophylla is a shrub that typically grows to a height of and has glabrous branchlets. Its leaves are linear, long and wide and sessile with a short curved point on the tip. The flowers are arranged on the ends of short side shoots and are in diameter, and sessile or on a peduncle up to long. There are up to five bracts long below each flower. The five sepals are long, the outer sepals wide and the inner ones slightly broader. The five petals are bright yellow, egg-shaped with the narrower end towards the base and long with a notch at the tip. There are eight to eleven stamens, fused at the base and on one side of the two carpels that each contain four ovules. Flowering occurs from June to October.
