Ornithogalum narbonense reaches on average 40–50 centimetres (16–20 in) of height, with a maximum of 70 centimetres (28 in). The bulbs are whitish and ovoid. The stems are erect and the long leaves are fleshy and lance-shaped, 8–15 millimetres (0.31–0.59 in) wide. The raceme is pyramidal, with 25-75 hermaphrodite flowers. Each flower has a long bract of 1–2 centimetres (0.39–0.79 in) and six star-shaped milky white petals bearing a pale green central vein, while the buds are oval, with longitudinal green and white stripes. The six stamens have a white filament holding yellow anthers of 4 millimetres (0.16 in). The flowers are pollinated by insects. The flowering period extends from May through June.