A new species, Cardiospermum cuchujaquense from Sonora, Mexico, is des
cribed and illustrated. The new species belongs to C. sect. Carphosper
mum, which is characterized by the presence of chaffy or scaly trichom
es. With the discovery of C. cuchujaquense, a pattern of disjunct dist
ribution is documented for C. sect. Carphospermum.