Published in A. St.-Hil., Naudin. (1842). In: Ann. Sci. Nat. Ser. II. 18: 49.
Abutilon megapotamicum or Callianthe megapotamica is a species of Abutilon native to Argentina, Brazil and Uruguay. It is a shrub growing to 2.5 metres tall, with leaves 5–8 centimetres (2.0–3.1 in) long, ovate to shallowly three-lobed. The flowers are orange-yellow with a red base, with five petals about 4 centimetres (1.6 in) long.