Now someone is going to say well if you know what you are doing then you can build any type of bow out of any kind of wood. My answer is yes you are more or less right, however you have to keep in mind that subsistence hunter and gathers are going to want to make a quick easy bow that will make meat and be durable so they will be looking for the path of least resistance. If that means making their tropical hardwood bow 7 feet (do to poor tension strength) even though they are in the jungle that's what they will do.
Just my two cents
Dictionary, I think Oglala was referring to username Darwin, not darwinian evolution
Darwin, from what I understand, peoples of the tropics used palm rather than the tropical hardwoods we modern bowyers like to make use of in laminated bows. I don't know the properties of palm, but I tend think it is tension strong like bamboo.
I don't think quick and easy and durable were the operating standards of most subsistence hunters. Look at the composite bows of western North America, or the cable backed bows of the Inuit. Certainly not the path of least resistance. I think the bow was also important culturally as a means of showing ones skill. A means of showing off.