Stachyacanthus
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Lamiales
Family:	Acanthaceae
Genus:	Stachyacanthus Nees (1847)
Species:	S. riedelianus
Binomial name
Stachyacanthus riedelianus Nees (1847)

Stachyacanthus is a monotypic genus of flowering plants belonging to the family Acanthaceae. The only species is Stachyacanthus riedelianus.^[1]

The species is found in Mato Grosso state of west-central Brazil.^[1]