saigyou ayakashi
A youkai cherry blossom tree, and is the largest cherry blossom in the gardens of Hakugyokurou with the power to bring death to the living.
Yuyuko attempted to overpower the seal on the tree in order to both see the legendary blossoms, and to resurrect the soul that was sealed within, not aware that her body is the seal of the cursed cherry tree.
See also
- Touhou Wiki: http://en.touhouwiki.net/wiki/Saigyou_Ayakashi