Urera kaalae is a long-lived perennial shrub or small tree in the Urticaceae (nettle) family. It is a small tree or shrub 3 to 7 m (10 to 23 ft) tall. The sap of the plant becomes greenish black when exposed to air. Leaves are pale green, thin and membranous, heart-shaped, and 10 to 27 cm (4 to 11...