Goodenia hederacea is a prostrate or ascending, perennial herb with stems up to 80 cm (31 in) long. The leaves are linear to elliptic or round, 10–120 mm (0.39–4.72 in) long and 3–25 mm (0.12–0.98 in) wide on a petiole up to 40 mm (1.6 in) long. The flowers are arranged in racemes up to 80 cm (31 in) long on a pedicel up to 50 mm (2.0 in) long with linear bracteoles 3–5 mm (0.12–0.20 in) long. The sepals are linear to lance-shaped, 3–5 mm (0.12–0.20 in) long, the corolla 8–15 mm (0.31–0.59 in) long with cottony hairs on the back. The lower lobes of the corolla are 3.5–7 mm (0.14–0.28 in) long with wings up to 2 mm (0.079 in) wide. The fruit is an oval capsule 5–9 mm (0.20–0.35 in) long.