Lophostemon grandiflorus subsp. riparius (Domin) Peter G.Wilson & J.T.Waterh.

Wilson, Peter G. & Waterhouse, J.T. (1982) Australian Journal of Botany 30: 430.

Nox, Northern Swamp; Northern Swamp Box

Bark almost fibrous like a eucalypt stringybark. Pale brown, brittle stripes in the blaze.

Oil dots visible with a lens if not visible to the naked eye. Leaf blades about 5-12 x 2-6.5 cm. Midrib +/- flush with the upper surface. Terminal buds and younger twigs clothed in white hairs.

Calyx lobes obtuse, persistent. Staminal fascicles up to 4-5 mm long, opposite the petals. Stamens usually 18-45 per fascicle.

Fruit about 5-7 mm diam., included in the calyx tube (hypanthium). Seeds linear, about 1-2 mm long.

Cotyledons +/- orbicular, about 3-4 mm diam. on a comparatively long slender petiole. At the tenth leaf stage: leaf blade ovate or lanceolate, oil dots numerous, visible with a lens and perhaps to the naked eye. Seedling +/- glabrous. Seed germination time 5 to 7 days.

Endemic to Australia, occurs in WA, NT, CYP, NEQ and CEQ. Altitudinal range in northern Australia from sea level to 600 m. Usually grows as a rheophyte along creeks and gullies through open forest but sometimes occurs in gallery forest and on rain forest and monsoon forest margins.