The flowers are in terminal panicles above the leaves. The individual flowers are 1 inch (2.5 cm) wide and have 5 bright yellow, fan-shaped, cupped petals and a cluster of yellow anthers atop a hairless staminal column. The flowers are followed by schizocarps with variable numbers of carpels, each containing 3 to 4 seeds. The leaves have finely saw-toothed margins and are dull green above, whitish gray below, velvety-hairy, alternate, palmately-veined, petiolate, and heart-shaped with a narrow, tapering tip. The leaves are very large, with petioles up to 6 inches (15 cm) long and leaf blades up to 10 inches (25 cm) long. The stems are upright, green to tinged reddish above and woody at the base, and almost hairless or covered with tiny, short, fuzzy hairs.
The diameter of the fruit is greater than length. The shape is a flattened hemisphere. For the similar Abutilon parishii, the diameter and length are about equal. (per RL - The reventum has the rounded top on the fruit, the parishii has the cusps on it. It appears the discolorous aspect of the leaves is variable for both species.)