ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ noun
Etymology: so called from the shape of the flower
1.
a. : any of certain Australian shrubs or trees of the family Myrtaceae that are widely cultivated in warm regions especially for their spikes of brightly colored flowers:
(1) : any plant of the genus Callistemon
(2) or bottlebrush tea tree : honeymyrtle
b. : australian honeysuckle
2. or bottlebrush grass : a grass of the genus Hystrix ; especially : a No. American grass ( H. patula )