Brosimum utile of the family Moraceae. There are a few other woods that use the common name cowtree, but it is my intent that the woods shown on this page are all Brosimum utile (and they are, to the best of my knowledge). The name palo de vaca is also, among others, used for this wood in the USA.
my samples: NOTE: these pics were all taken in very bright incandescent lighting ("soft white" at 2700K) colors will vary under other lighting conditions
both sides of a sample plank of lechero (cowtree) / Brosimum utile
end grain and end grain closeup of the piece directly above