Solanum incompletum, a short-lived perennial member of the nightshade family (Solanaceae), is a woody shrub up to 3 m (10 ft) tall. Its stems and lower leaf surfaces are covered with prominent reddish prickles about 4.0 mm (0.2 in) long or sometimes with yellow fuzzy hairs on young plant parts and lower leaf surfaces. The oval to elliptic leaves, 10 to 15 cm (4 to 6 in) long and about 7.0 cm (2.8 in) wide, have prominent veins on the lower surface, and are on stalks up to 7.0 cm (2.8 in) long. The leaf margins are lobed with 1 to 4 lobes on each side. Numerous flowers grow in loose branching clusters with each flower on a stalk about 9.0 mm (0.4 in) long. The calyx and flowers generally lack prickles. The white petals form a star-shaped corolla about 2.0 cm (0.8 in) in diameter. The curved anthers, about 2.0 mm (0.08 in) long, top short filaments that do not extend beyond the petals. Fruits are round berries about 1.5 cm (0.6 in) in diameter, which mature from yellow-orange to black. This species differs from other native species in the genus by being generally prickly and having loosely clustered white flowers, curved anthers about 2.0 mm (0.08 in) long, and berries 1.0 to 2.0 cm (0.4 to 0.8 in) in diameter.