Mountain Mahogany, Half-peeled Banana. Mountain Mahogany is a large Southern African tree. The fruit of this species is remarkable and when green has the form of a cigar- or club-shaped capsule. When mature the five woody, closely lenticellate, pale brown valves curve back from the thickened tip, leaving a central column intact with impressions of the seeds - in overall appearance that of a half-peeled banana. Seeds are large and winged, and carried some distance from the tree by wind.