Dalbergia nigra Fr. Allem. is mainly produced in Brazil. The trade name is Brazilianwood, jacaranda. The growth wheel is obvious. Heartwood black brown, chocolate to purple brown, often with obvious black narrow stripes. The tube holes are quite obvious under the naked eye, and the chord diameter is at most 287 μm, with an average of 143 μm; the number is very small to slightly less, 2 to 7/mm 2 . Axial thin-walled tissue under the magnifying glass is obvious. The main type is the off-tube type, the bundle tube is bundled and narrow-banded (1 to 2 cells wide), and the star-scattering polymerization is poly-winged, often more than dimpled Dalbergia.
Wood fiber walls are thin to thick. The wood ray is obvious under the magnifying glass, and the wave marks are obvious under the magnifying glass. The ray tissue has the same shape (several number) and multiple columns (mostly 2 to 3 columns), and the profile III type tends to be obvious. The new cut surface is rich in acidity, fine in structure (slightly thicker than other species), staggered texture, air dry density O.86~1.01 g/cm3.
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