Ornithogalum species

Here are two photos of an Ornithogalum sp. from South Africa, Western Cape region. I'm not able to determinate it.

The flowers keep open only for a day (as the bulbine's) and open only if the light is enough. The section of the leaves, that are succulent and light green, is triangular.

Jean-Baptiste Boudias (February 5, 2007)
France