Leptospermum polygalifolium subsp. howense, commonly known as tea tree or tea-tree, is a flowering plant in the myrtle family, Myrtaceae. The subspecific epithet refers to the island to which the subspecies is endemic.
It is a rough-barked shrub or small spreading tree, growing to about 5 m, occasionally to 10 m. The narrowly elliptic to narrowly oblanceolate leaves are 5âÂÂ8 mm long and 2âÂÂ2.5 mm wide. The conspicuous white flowers, 15 mm across, appear from November to January. The fruits are woody, 6 mm diameter, domed, 5-valved capsules.
The subspecies is endemic to Australia's subtropical Lord Howe Island in the Tasman Sea. It is a characteristic plant of the island's mountain peaks, sometimes occurring at lower elevations, in evergreen forest and shrubland.