White is the lightest color and is achromatic (having no hue). It is the color of fresh snow, chalk and milk, and is the opposite of black. White objects fully reflect and scatter all the visible wavelengths of light.[from wikipedia]

A Hellebore was planted in the front yard. It's flowers were white.

A Hellebore was planted in the front yard. It's flowers were pale yellow, and slowly turned white.

The flowers have five petal-like sepals surrounding a ring of small, cup-like nectaries which are actually petals modified to hold nectar. The sepals do not fall as petals would, but remain on the plant, sometimes for many months.[from wikipedia]