Are there leaves that are not green?

Answer 1

Yes.

-Some leaves are reddish, like a red beech, but these are still green underneath the red pigment.

-Some leaves are mottled or piebald, especially in cultivars of certain plants. This rarely occurs in nature as the non-green bits of leaf contribute less or not at all to the plant's photosynthesis, and so will be selected against from an evolutionary viewpoint.

-Green leaves sometimes turn red or yellow in autumn, and lose their green pigment entirely.

-Some parts of plants that have other functions sometimes have other colors as well, e.g. the leaves near a flower (think poinsettia, Euphorbia pulcherrima) or the modified leaves that make up a flower.

-Finally, there are plants that have no need of chlorophyll (green pigment) because of their parasitic way of life: they suck what they need out of another plant, e.g. in the genus Orobanche.

These are all the examples I can think of at the moment.