Leptospermum polygalifolium subsp. montanum

It grows at the heads of mountain streams, or in rocky areas within crevices with shallow soils, often derived from granite or basalt. Usually seen in relatively fire free areas at high altitude in rainforests or rainforest margins north of the Barrington Tops region.^[1] The most northerly recording is at Mount Cordeaux.

Usually seen as a shrub, one to seven metres tall. Though at Mount Hyland Nature Reserve it grows to 25 metres tall and a stem diameter of 56 cm.^[2] The trunk is not regular, with vertical flutings, particularly near the base. Bark is papery on older trees, greyish or pale brown. New branchlets are thin with soft silky hairs. Leaves are alternate on the stem, 10 to 15 mm long, 3 to 5 mm wide, usually with a blunt point. Leaf margins curl over, dark green above, paler below the leaf. Silky hairs appear on the young leaves. Leaves are reverse lanceolate to elliptic in shape. Leaf stems short or indistinct. Oil dots easily noticed under a lens. Only the midrib is visible on the bottom surface of the leaf.

Single white flowers form from October to January, 12 mm in diameter. The hypanthium is around 3.5 mm long, the sepals around 2 mm long. The fruit is a grey hemispherical capsule with a flat base, 6 to 9 mm in diameter. The capsule stalk is 2 to 3 mm long. When opening, the capsule reveals five widely spreading valves. Fruit matures from October to April.