Arisaema sikokianum

Arisaema sikokianum (back view) Cobra Lily
Arisaema sikokianum

This Aroid bulb is quite unusual and is in flower now. It is from southern Japan and was named after the Island of Shikoku where it is now considered a threatened species. Bulbs such as this one are usually available from specialist nurseries usually by mail order. They like a semi shaded position under trees where the soil may contain a generous amount of leaf mould.
2017 update: I have no plants of this available.