落尾木属（学名：Pipturus）是荨麻科下的一个属，为灌木或乔木植物。该属共有40种，分布于东亚至大洋洲。

Pipturus albidus, known as māmaki (sometimes waimea, for its resemblance to olomea) in Hawaiian and known as Waimea pipturus in English, is a species of flowering plant in the nettle family, Urticaceae, that is endemic to Hawaiʻi. It inhabits coastal mesic, mixed mesic, and wet forests at elevations of 60–1,830 m (200–6,000 ft). Māmaki is a small tree that reaches a height of 9 m (30 ft) and a trunk diameter of 0.3 m (0.98 ft).