Gleditsia triacanthos (Leguminosae) is a deciduous tree native to the Eastern USA.
The first invasive record of G. triacanthos in the Iberian Peninsula is here reported.
The invaded area (Guadiamar river, southern Spain) is under a Csa climate type,
which is an infrequent and unexpected type for that species to behave as invasive.
The analysis of trunk perimeters and of the spatial distribution showed a net
recruitment and an invasive trend throughout the temporary stretch of the river.