How to Identify Goupia

Start with color and weight together. Goupia heartwood is a warm golden-brown that often carries a distinct olive or greenish cast, deepening toward brown with exposure, and it is set off from a paler yellowish sapwood. In the hand the wood feels dense and heavy for its size, and a thumbnail does not press in easily — consistent with its hard, ~1,500 lbf Janka rating. A board that is both olive-brown and noticeably heavy is a strong Goupia candidate.

Examine the grain and surface. Goupia is straight-grained to shallowly interlocked, so quartered faces show a subtle, low-contrast stripe rather than any bold figure; the texture is fine and even with a modest luster. There is no dramatic ray fleck or strong ribbon. Diffuse-porous end grain shows small to medium pores scattered fairly evenly, without the ring of large earlywood pores you would see in an oak.

Use scent as a diagnostic cue. Freshly cut or damp Goupia gives off a characteristic unpleasant, foul or sour smell — an unusual and useful identifier that separates it from many similarly colored tropical hardwoods. The odor diminishes as the wood seasons, so dry, finished stock may be nearly odorless.

The most likely confusions are with other dense, brownish tropical timbers. Compared with teak, Goupia lacks teak's oily feel and leather-like scent and tends more olive than golden. Against reddish-brown woods like cumaru or jatoba, Goupia is generally lighter in tone and greener, and its foul green odor is distinctive where those woods smell faintly spicy or neutral. Angelique/basralocus, another Guianan structural wood, overlaps in use and weight but runs more red-brown; end-grain pore patterns and Goupia's olive tone and odor help separate them.