Synonyms for Sorrel Tree (same or very similar meaning)
WordNet sense 1 (deciduous shrubby tree of eastern North America having deeply fissured bark and sprays of small fragrant white flowers and sour-tasting leaves):
sourwood, titi, Oxydendrum arboreumWordNet sense 2 (Australian tree with acid foliage):
Hibiscus heterophyllusFrom the ODE community, based on WordNetadd/edit