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titi, sorrel tree, sourwood, Oxydendrum arboreum | deciduous shrubby tree of eastern North America having deeply fissured bark and sprays of small fragrant white flowers and sour-tasting leaves ❲Oxydendrum arboreum❳ | |
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sorrel tree, Hibiscus heterophyllus | Australian tree with acid foliage ❲Hibiscus heterophyllus❳ |