Croton urucurana

Native to South America from Peru to Brazil and northeastern Argentina, this tree grows about 13 to 49 feet tall, especially beside rivers and in streamside forests. Its bark releases blood-red sap. Heart-shaped to elongated leaves have pale, densely hairy undersides and small glands near the top of the leaf stalk. Separate male and female flowers grow in elongated clusters, followed by small seed capsules. Photographed near Boquete, Panama.