Calothamnus quadrifidus is a shrub from the south-west of Western Australia. Its common name is the One-sided Bottlebrush which alludes to the arrangement of the stamens of its inflorescence which line up on one side of the stem.
It usually grows to around 2.5 metres in height and width and it flowers from mid-winter to early summer. It has red, white and yellow flower forms, with the red flowered form most commonly seen in cultivation.
- FloraBase: the West Australian Flora: Calothamnus quadrifidus
- Association of Societies for Growing Australian Plants (ASGAP): Calothamnus quadrifidus
- "Calothamnus quadrifidus R.Br.". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government.
Media related to Calothamnus quadrifidus at Wikimedia Commons
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