African savannah isn’t the homogenous, steady monotony that it appears on the Discovery Channel. (Well, back when the discovery channel showed nature documentaries, anyway.) Dirt roads and hills criss-cross it, and fever trees like this one grow where more water is available. The yellow-green bark comes from photosynthetically active cells. The name comes from an interesting illustration of the post hoc ergo propter hoc fallacy: when early European settlers went near water, they tended to contract malaria (thus the fever). They incorrectly attributed this to the trees, rather than the mosquitos breeding in the water.
Decaseconds 