Plagiosiphon longitubus

{{Short description|Species of legume}}

{{Speciesbox

|image =

|status = CR

|status_system = IUCN2.3

|status_ref = {{cite iucn |author=Cheek, M. |author2=Cable, S. |date=2000 |title=Plagiosiphon longitubus |volume=2000 |page=e.T39526A10245384 |doi=10.2305/IUCN.UK.2000.RLTS.T39526A10245384.en |access-date=15 November 2021}}

|genus = Plagiosiphon

|species = longitubus

|authority = (Harms) J.Léonard

}}

Plagiosiphon longitubus is a species of plant in the family Fabaceae. It is found in Cameroon. Its natural habitat is subtropical or tropical dry forests. It is threatened by habitat loss.