saigyou ayakashi
A great cherry blossom tree youkai, and the largest cherry tree in the gardens of Hakugyokurou with the power to bring death to the living.
Yuyuko once attempted to overpower the seal on the tree in order to see the legendary blossoms, as well as resurrect the soul that was used to seal it, not aware that it's her own body.
See also
- Touhou Wiki: http://en.touhouwiki.net/wiki/Saigyou_Ayakashi