Calycacanthus

{{Short description|Genus of plants}}

{{Speciesbox

|image =

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|genus = Calycacanthus

|parent_authority = K.Schum. (1889)

|species = magnusianus

|authority = K.Schum. (1889)

}}

Calycacanthus magnusianus is a species of flowering plant belonging to the family Acanthaceae. It is endemic to New Guinea.{{cite web |title=Calycacanthus K.Schum. {{!}} Plants of the World Online {{!}} Kew Science |url=https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:446-1 |website=Plants of the World Online |access-date=20 March 2021 |language=en}} A new species in genus Calycacanthus, C. insularis, was discovered in 2023.[https://www.researchgate.net/publication/374578453_Revision_of_Calycacanthus_Acanthaceae_Justicieae_Monotheciinae_with_a_New_Species_from_Papua_New_Guinea Revision of Calycacanthus (Acanthaceae: Justicieae: Monotheciinae) with a New Species from Papua New Guinea]