Juglands spp. of the family Juglandaceae. Includes numerous species in the genus Juglands. "Tropical" walnut (on this site) includes any walnut that is specified as being either "tropical", OR from anywhere in South America, including Peruvian walnut which itself consists of at least 4 species in the genus Juglands.
my samples:
both sides of a planks listed as Argentine walnut / Juglans australis
end grain and end grain closeup of the piece directly above
Peruvian walnut plank and closeup --- the piece directly below is taken from this plank
one side and end grain of a plank that was cut from the larger plank directly above, and then sanded on all surfaces.
the other side and end grain of the same plank
end grain closeups from both ends of the piece directly above --- the slanted streaks in the top pic and the horizontal streaks in the bottom pic are sanding scratches. In both cases, the fine, lighter, streaks that run perpendicular to the growth rings are rays.
numerous views of the same 12-foot long plank of Peruvian walnut
Peruvian walnut planks photographed at a lumber yard --- the pics are a little washed out and the wood is just slightly darker that what shows up here, but no where near as dark as the planks directly above
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