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)
Tree
Click/tap on images to enlarge
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
Family

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

Common name

Nox, Northern Swamp; Northern Swamp Box

Stem

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

Leaves

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.

Flowers

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

Fruit

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

Seedlings

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.

Synonyms
Tristania suaveolens var. riparia Domin, Biblioth. Bot. 89: 1025(1928), Type: Queensland, Cloncurry River, Feb. 1910, K. Domin 7117; holo: PR.
RFK Code
979
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