Stelmagonum

{{Short description|Genus of plants}}

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|image =

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|display_parents = 3

|genus = Stelmagonum

|parent_authority = Baill.

|species = hahnianum

|authority = Baill.

|synonyms =

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Stelmagonum hahnianum is a species of flowering plants belonging to the family Apocynaceae. It is the sole representative of the genus Stelmagonum.{{cite web |title=Stelmagonum Baill. {{!}} Plants of the World Online {{!}} Kew Science |url=https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:296618-2 |website=Plants of the World Online |access-date=25 May 2021 |language=en}}

Its native range is Southwestern Mexico. Ibatia holtonii was once placed in the genus as Stelmagonum holtonii.{{cite web |title=Ibatia holtonii (Vail) Morillo |url=https://www.gbif.org/species/7649869 |website=www.gbif.org |access-date=4 November 2021 |language=en}}