Australian Tropical Rainforest Plants - Online edition

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

Shrub (woody or herbaceous, 1-6 m tall)
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Flowers. © R.L. Barrett
Leaves and flowers. © R.L. Barrett
Leaves and flowers. © R.L. Barrett
Leaves and fruits. © CSIRO
Scale bar 10mm. © CSIRO
Trunk. © R.L. Barrett
Habit. © R.L. Barrett
Cotyledon stage, epigeal germination. © CSIRO
10th leaf stage. © CSIRO

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

Common name

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.

Distribution and Ecology

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.

Tristania suaveolens var. riparia Domin, Biblioth. Bot. 89: 1025(1928), Type: Queensland, Cloncurry River, Feb. 1910, K. Domin 7117; holo: PR.
RFK Code
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