Geniostoma is a genus of around 49 species of flowering plants in the family Loganiaceae.

[1] They are shrubs or small trees, with inflorescences borne in the axils of the simple, petiolate, oppositely-arranged leaves.

[2] The name Geniostoma derives from the Greek words γένειον (geneion; "beard") and στόμα (stoma; "mouth"), referring to the hairs in the corolla tube of some species.

[3] The genus is widely distributed across the Pacific Ocean from Japan, Malesia to Australia in the west, and east to the Tuamotu Archipelago; one species is also found on the Mascarene Islands.

[3] The Hawaiian endemic genus Labordia is included in Geniostoma by Plants of the World Online and other authors.