Neomartensia Borhidi & Lozada-Pérez Martensianthus is a genus of flowering plants belonging to the family Rubiaceae.

[1] It is native to southern Mexico.

[1] The genus name of Martensianthus is in honour of Martin Martens (1797–1863), a Belgian botanist and chemist born in Maastricht, Netherlands.

[2] It was first described and published in Acta Bot.

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