Cartrema is a small genus of flowering plants in the olive family (Oleaceae), order Lamiales. It comprises several species of evergreen shrubs and small trees, most notably the North American devilwood (Cartrema americana). The genus was formerly classified as section Leiolea within Osmanthus but was elevated to genus rank based on morphological differences — most distinctly its paniculate (branched) inflorescences, which contrast with the fasciculate or cymose flower clusters of Osmanthus. The genus has a disjunct distribution spanning southeastern Asia, southern China, and North America. In North America, Cartrema americana ranges across the southeastern United States from Texas to Virginia and south through eastern and southern Mexico.
Distribution
Cartrema has a disjunct distribution spanning two main regions: southeastern Asia (including southern China, Taiwan, Vietnam, Thailand, Laos, Cambodia, Malaysia, and Sumatra) and North America (the southeastern United States from Texas to Virginia, plus eastern and southern Mexico and Central America). The type species, Cartrema americana (devilwood), is the sole North American representative.
Taxonomy
Cartrema was formerly treated as section Leiolea within the genus Osmanthus. It was elevated to genus rank based on inflorescence morphology: Cartrema produces paniculate (branched) inflorescences, whereas Osmanthus bears fasciculate or cymose flower clusters. The genus belongs to the family Oleaceae (order Lamiales) and comprises several species with a disjunct distribution across southeastern Asia and North America.
