Nautilocalyx erytranthus (Gesneriaceae), a new species from Northwestern Amazonia

A new species from western Amazonia is described and illustrated. Nautilocalyx erytranthus (Gesneriaceae) is characterized by an obligate terrestrial habit; leaf blades that are cuneate to attenuate at the base; and red funnelform corolla with an oblique limb and reflexed petal lobes with glandular trichomes clustered on the lateral and lower inner surfaces of the throat.