Geniostoma is a genus of around 49 species of flowering plants in the family Loganiaceae. They are shrubs or small trees, with inflorescences borne in the axils of the simple, petiolate, oppositely-arranged leaves.[1] The flowers are arranged in cymes, and each is pentamerous.[1]
The name Geniostoma derives from the Greek words Greek, Modern (1453-);: [[wikt:γένειον|γένειον]] (Greek, Modern (1453-);: geneion; "beard") and Greek, Modern (1453-);: [[wikt:στόμα|στόμα]] (Greek, Modern (1453-);: stoma; "mouth"), referring to the hairs in the corolla tube of some species.[2] 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.[2]
The Hawaiian endemic genus Labordia is included in Geniostoma by Plants of the World Online and other authors.[2] [3] The Hawaiian species are commonly known as labordias or as Kamakahala in Hawaiian.[4] These two genera have been grouped together in the family "Geniostomaceae",[5] but are considered by the Angiosperm Phylogeny Group to be part of a wider Loganiaceae.[6]
49 species are accepted.