Pau Rosa (Bobgunnia madagascariensis)

Pau Rosa (Bobgunnia madagascariensis)

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Common Name(s): Pau Rosa

Scientific Name: Bobgunnia fistuloides, B. madagascariensis
(syn. Swartzia fistuloides, S. madagascariensis)

Distribution: Small clusters within African rainforests

Tree Size: 70-90 ft (21-27 m) tall, 2-3 ft (.6-1 m) trunk diameter

Average Dried Weight: 64 lbs/ft3 (1,030 kg/m3)

Specific Gravity (Basic, 12% MC): .82, 1.03

Janka Hardness: 2,940 lbf (13,080 N)

Modulus of Rupture: 24,100 lbf/in2 (166.2 MPa)

Elastic Modulus: 2,480,000 lbf/in2 (17.10 GPa)

Crushing Strength: 13,450 lbf/in2 (92.8 MPa)

Shrinkage: Radial: 4.2%, Tangential: 6.0%, Volumetric: 10.7%, T/R Ratio: 1.4

Color/Appearance: Heartwood tends to vary in color from a pink or yellow to a darker reddish brown, with darker brown streaks common. White to pale yellow sapwood clearly demarcated from heartwood. Color tends to darken with age. Bobgunnia madagascariensis tends to be more on the reddish or orangish side, while B. fistuloides tends to be a more subdued brown.

Grain/Texture: Grain tends to be wavy or interlocked. Uniform medium to coarse texture, with a high natural luster.

Endgrain: Diffuse-porous; medium-large pores in no specific arrangement; solitary and radial multiples of 2-3; heartwood gum deposits common; growth rings indistinct; rays not visible without lens; parenchyma aliform (lozenge and winged), confluent, and banded.

Rot Resistance: Rated as very durable regarding decay resistance, and is also resistant to insect attack. Pau Rosa has good weathering characteristics in outdoor applications.

Workability: Generally easy to work despite its density, though cutting resistance can be high, and the wood has a tendency to burn while being drilled. Planes fairly well despite having interlocked grain (typically only slightly interlocked). Turns, glues, and finishes well.

Odor: No characteristic odor.

Allergies/Toxicity: Although severe reactions are quite uncommon, Pau Rosa has been reported to cause skin irritation. See the articles Wood Allergies and Toxicity and Wood Dust Safety for more information.

Pricing/Availability: Not too commonly seen in the United States, Pau Rosa should be in the mid to high range for an imported African hardwood. Sizes likely limited to smaller blocks, veneers, and turning squares, with larger lengths of lumber much less common.

Sustainability: This wood species is not listed in the CITES Appendices, and is reported by the IUCN as being a species of least concern.

Common Uses: Veneer, carvings, furniture, turned objects, and other small, specialty wood items.

Comments: Formerly classified in the Swartzia genus along with Katalox and Wamara, Pau Rosa has since been placed into its own genus, Bobgunnia.

Pau Rosa is one of only a handful of woods that have the potential of being nearly rainbow-colored; its appearance is reminiscent of Tulipwood or Canarywood.

Related Species:

None available.

Related Articles:

None available.

Scans/Pictures: A special thanks to Steve Earis for providing the wood sample and turned photo of this wood species, as well as Rory Wood for providing the samples to demonstrate the color differences between Bobgunnia fistuloides and B. madagascariensis.

Pau Rosa (Bobgunnia madagascariensis)

Pau Rosa, B. madagascariensis (sanded)

Pau Rosa, B. madagascariensis (sealed)

Pau Rosa, B. madagascariensis (sealed)

Pau Rosa, B. fistolodoies (sanded)

Pau Rosa, B. fistuloides (sanded)

Pau Rosa, B. fistolodoies (sealed)

Pau Rosa, B. fistuloides (sealed)

Pau Rosa (endgrain)

Pau Rosa (endgrain)

Pau Rosa (endgrain 10x)

Pau Rosa (endgrain 10x)

Pau Rosa (turned)

Pau Rosa (turned)