Pierranthus is a monotypic genus of flowering plants belonging to the family Linderniaceae.

[2] Its native range is Indo-China and it is found in Cambodia, Thailand and Vietnam.

[1] The genus name of Pierranthus is in honour of Jean Baptiste Louis Pierre (1833–1905), a French botanist known for his Asian studies.

[3] The genus has one known synonym of Delpya Pierre ex Bonati.

[2] The Latin specific epithet of capitatus is derived from capitate meaning having dense-headed growth.