Costus louisii is a critically endangered species of plant endemic to Gabon.

[1] Costus louisii was first described by Hiltje Maas-van de Kamer and Paul Maas in 2016.

[2] A.M. Louis collected the first and only specimen of Costus louisii obtained from the wild.

[1] Costus louisii has only been found in a small area, and its habitat appears threatened by human actions.

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