noun
Refers specifically to the tree peony (Paeonia suffruticosa), a woody shrub with large flowers. Compare with 牡丹 (ぼたん), which can refer to peonies in general or the herbaceous peony.
See also: 牡丹 (ぼたん)
花王は牡丹の一種で、木のように茎が硬くなる。
The tree peony is a type of peony whose stems become woody like a tree.