The hard, rough, furrowed trunk is characteristic of blackwood. Its 'leaves' are actually flattened leaf stalks and the flowers are whitish to pale yellow.
It has been recognised since the 19th century as a high-quality ornamental timber used in wood-turning and furniture-making. The wood is strikingly similar to American walnut.
You can see a protected stand of blackwood trees in a giant sinkhole at Dismal Swamp, west of Smithton.