Nemophila menziesii is variable in appearance. Lower leaves are stalked, lobed and oppositely arranged, 10–50 millimetres (0. 4–2. 0 in) with five to thirteen lobes, each entire or with one to three teeth. Upper leaves are more or less sessile and less lobed than lower. The stalk of the inflorescence is 20–60 millimetres (0. 8–2. 4 in). Calyx lobes are 4–8 millimetres (0. 2–0. 3 in). The flower is blue with a white center or all white, usually with blue veins and black dots near the center. It is 6–40 millimetres (0. 2–1. 6 in) wide. The tube is less than or equal to the filaments.