Chaunanthus gracielae is transferred to Mostacillastrum based on a critical evaluation of morphology. The two genera are readily distinguished by habit, indumentum, leaf, flower, and fruit features. As a result, the New World Mostacillastrum now includes 31 species, of which M. gracielae is easily distinguished from the remaining species by its stigmas prominently 2-lobed opposite the fruit replum.
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