This article reports on Cordia dentata Poir. which has become a naturalized Boraginaceae
species in Taiwan. The species is distinguished by a striated calyx that splits circumscissily or
tears irregularly and by a yellow twisted corolla that is notably larger than those of related taxa.
It is native to tropical America, particularly Central America and the Caribbean, and is valued for
its medicinal properties. Field observations confirm self-sustaining cohorts at several introduction
sites. These observations meet the C3 naturalization criteria defined by Blackburn et al., indicating
that the species is recently naturalized rather than invasive. This study provides a detailed
morphological description, photographs, a distribution map, and a key for identifying wild Cordia L.
species in Taiwan.