Zantedeschia.

So far, I've been using the Royal Horticultural Society website as I try to learn about plants. I was idly browsing their lists, and came across zantedeschia. They are stunning, and had to note them next.

Zantedeschia, "Calla" or "Arum Lily".
(Tuberous perennial.)

Planting: Spring.
Flowering: Late spring to summer.
Aspect: Full sun to partial shade.
Hardiness: Species vary.

Notes: The white Zantedeschia aethiopica is often used as a symbol of purity at weddings and funerals, and the plant is often depicted in paintings.

All credit to the RHS for this fine image.