Vomerine teeth present. Tongue more or less free posteriorly. Pupil of the eye horizontal. Toes webbed. Tips of fingers and toes expanded into discs. Tympanic membrane smaller than eye. When the hind leg is stretched along the body, the tibio-tarsal articulation commonly reaches the anterior edge of the eye. Dorsal skin smooth, ventral skin granular. Dorsal coloration varies from green to light-grey, brown, or almost black depending on substrate color and temperature. Coloration changes depending on substrate. No dark spot below the eye. Ventral surface white or yellowish. Dorsal surface divided from ventral surface by thin, dark, uninterrupted band with outer white edging. This band usually forms an inguinal loop, except for some individuals of H. arborea schelkownikowi. If the inguinal loop is absent, the dark band reaches the inner surface of the groin. A light line bordering lips. Male differs from female by having a large guttural vocal sac (visible externally) which is distinguished by darker skin folds and wrinkles on the throat.