Jack in the Pulpit

Arisaema candidissimum, also known as White spathed Jack in the Pulpit. Related to the common British native plant Arum maculatum, Lords and Ladies, this plant emerges from it's underground tuber shortly before these flowers appear. As the flowers fade taller stems with three leaflets appear, quite distinctive and attractive in themselves. All you want to know about Arisaema candidissimum here