This is Arisaema tortuosum, also known as Whipcord Cobra Lily. Growing up to 6 feet high, this unusual lily does best in an area with light shade and moisture. It can be planted in full shade if you wish. The spadix is a whip like tongue that darts out the side of the mouth and shoots straight up. This vertical tongue is green or purple and can reach a foot high sometimes. The roots must be thoroughly dried or cooked before they can be eaten. But that is exactly what they do in Nepal. Mixed with lime juice, the fresh tubers are buried and left to ferment. Once ready, the tubers are dug up, washed and cooked. However, if eaten in excess, these tubers can cause violent illness. USDA Hardiness Zones 6 to 9.