Lovoa trichilioides (syn. Lovoa klaineana); possibly also contributing is one (or two) other Lovoa spec. of the family Meliaceae, the mahogany family
The official tradename is dibétou. Yielded by Lovoa, a genus of two (possibly three) species of tropical Africa --- not a true walnut (note that it's in the mahogany family)
My thanks to Paul van Rijckevorsel for this summary
my samples:
veneer sold to me as lovoa (one of the many common names for L. trichilioides) and described as "figured" although I would call it fiddleback for sure.
web pics
flat cut plank
planks
planks specifically listed as Lovoa trchiliodides and with the common name dibetou
flat cut veneer
quartersawn veneer
veneer
veneer
ribbon stripe veneer
curly veneer
crotch veneer
swirl veneer (a near-crotch)
listed as African walnut veneer, this looks to me to be more like a picture of a rough concrete sidewalk that someone has puked on. Sorry about that, but I call'm as I see'm.