Aspects of this topic are discussed in the following places at Britannica.
...in the order Oxalidales, comprising 26 genera of shrubs and trees, native primarily to tropical areas of the Southern Hemisphere. Several of the trees are cultivated as ornamentals, including Geissois racemosa, a New Zealand species with crimson flowers, and Cunonia capensis, a small southern African tree with clusters of small white flowers.
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