Its made of black palm, and its short size means is highly likely from South America. I've seen bows like that in antique stores in Peru.
There are other cultures from the tropical belt that use black palm, but the shorter ones are more common in South America.
Those bows turn up now and then, they're not always old and are not valued highly. Many of the natives make them for the tourist trade.
The arrows that sometimes come with those plain bows are fantastic pieces of craftsmanship.