noun
bluebeard; blue spiraea
A flowering plant, Caryopteris incana, known for its blue flowers. The name is usually written in katakana.
庭にダンギクが咲いている。
Bluebeard is blooming in the garden.
The name 段菊 (literally 'step chrysanthemum') likely refers to the tiered arrangement of its flowers, but the exact derivation is uncertain.