Abstract: Codonan the (Martius) Hanstein and Nematanthus Schrader (Gesneriaceae) are morphologically distinct genera of the evergreen and deciduous rain forests of Central and South America. Two subgenera and two sections had been recognized to accommodate the fourteen cultivated species of Cod on an the, whereas no subgeneric ranks were previously reported for the ten cultivated species of Nematanthus . Hybridizations between Codonanthe and...