We describe and illustrate a new myrmecophytic caesalpinioid legume species, Tachigali spathulipetala, from the highly endangered Brazilian Atlantic Forest domain. The new species is morphologically similar to T. pilgeriana and T. beaurepairei, but differs in having heteromorphic but mostly spathulate petals, and domatia-like cavities or callosities at the base of leaflets. An identification key to the Atlantic Forest species of Tachigali is also provided.
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Vol. 41 • No. 4