noun
Chinese peony; Paeonia lactiflora
Refers specifically to the herbaceous perennial plant with large, fragrant flowers, commonly grown in gardens and used in traditional medicine.
庭にシャクヤクが咲いている。
Chinese peonies are blooming in the garden.
牡丹 is a tree peony (woody shrub), while シャクヤク is an herbaceous peony that dies back in winter.
The Japanese name しゃくやく comes from the Chinese name 芍藥 (sháoyao). The kanji 芍薬 are used for the plant, but the exact origin of the Chinese name is uncertain.