|Thorny Yellowwood at Tooloom National Park, Australia|
Zanthoxylum brachyacanthum, known as the Thorny Yellowwood or Satinwood, is an Australian rainforest tree. The natural range is from the Clarence River (29° S) in New South Wales to tropical Queensland in the Eungella National Park and the Wet Tropics region.
This tree is in the family Rutaceae, which is sometimes known as the "citrus family" because this family also contains all of the species (such as the orange, lemon, etc.) in the genus Citrus., 
This tree grows on a variety of subtropical, tropical and drier rainforests, often on volcanic soils. Young trees are easily identified in the rainforest by the thorny trunk and the dark green glossy leaves.
This is a small tree, up to 15 metres tall and 35 cm around the trunk. The bark is grey, wrinkled and features sharp pointed lenticels on young trees. Older trees appear more smooth barked. Trees are mostly not buttressed or flanged at the base.
The leaves are alternate and pinnate, with five to sixteen shiny leaflets. Leaflets are alternate, 4 to 9 cm long, egg shaped or oblong, usually toothed and with evident oil glands. The branchlets have prickles and are green or blue/green. The leaf scars are noticeable.
The fruit matures from February to May, being a single cocci, bright red and shiny. It later changes color to a wrinkled dark brown, each fruit being 10 mm long. The cocci splits into two valves, with one black seed each, and are 6 mm long and shiny, attached by a membrane of a similar length. The seed germination is erratic.
This tree's small size, the interesting trunk, the attractive flowers and foliage makes the Thorny Yellowwood suitable as an ornamental plant. The timber is deep yellow and close grained, and thus it is suitable for decorative work.
The plant family contains some interesting alkaloids, coumarins, furano coumarins, and pryanocoumarins, ancetophenones such as Zantholoxylin, flavanoids like amurensin, and polyhydroxol flavainoids, and Amides.
- Richards, P.G. (2009). "Zanthoxylum brachyacanthum F.Muell.". PlantNET. Royal Botanic Gardens & Domain Trust, Sydney Australia. Retrieved 2009-06-06.
- Floyd, A.G., Rainforest Trees of Mainland South-eastern Australia, Inkata Press 1989, ISBN 0-909605-57-2 Page 345
- Hyland, B. P. M.; Whiffin, T.; Zich, F. A. et al. (Dec 2010). "Factsheet – Zanthoxylum brachyacanthum". Australian Tropical Rainforest Plants. Edition 6.1, online version [RFK 6.1]. Cairns, Australia: Commonwealth Scientific and Industrial Research Organisation, through its Division of Plant Industry; the Centre for Australian National Biodiversity Research; the Australian Tropical Herbarium, James Cook University. Retrieved 15 May 2013.
- "Food plants for Australian butterflies and caterpillars". Australian Butterfly Sanctuary. Retrieved 2009-06-04.
- Herbison-Evans, Don; Peter R. Samson, Stella Crossley (31 March 2009). "Papilio fuscus Goeze, 1779: Fuscus Swallowtail". Don Herbison-Evans, University of Technology Sydney. Retrieved 2009-06-04.[dead link]
- "Zanthoxylum brachyacanthum (Rutaceae); Thorny yellow-wood, satinwood". Brisbane Rainforest Action & Information Network. 2007. Retrieved 2009-06-04.
- Waterman 1973 'Chemosystematics in the Rutaceae II. The Chemosystematics of the Zanthoxylum/Fagara Complex", by F. Fish and P. G. Waterman © 1973 International Association for Plant Taxonomy (IAPT)
- Brophy, J. J.; Goldsack, R. J.; Forster, P. I.; Hutton, "Composition of the leaf oils of the Australian and Lord Howe Island species of Zanthoxylum (Rutaceae)." I Journal Journal of Essential Oil Research 2000 Vol. 12 No. 3 pp. 285-291 Record Number 20000311631 http://www.cabdirect.org/abstracts/20000311631.html
- Floyd, A.G., Rainforest Trees of Mainland South-eastern Australia, Inkata Press 1989, ISBN 0-909605-57-2
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