The results of a pollen study of 77 American species of Acacia (tribe Acaciae) characterizes pollen among the different New World taxa of the compound-pollen Mimosoideae on the basis of the most relevant morphologic and structural features.

Two pollen types and five subtypes are recognized and summarized in the diagnostic key presented herein. As a result of the species studied, some newly observed structural features are now utilized; these features modify the previous characterization of the pollen of Acacia, and include frequent ornamentation of the suprasubreticulate or supramicrorugulate exine, presence of subpseudocolpi in some species, and presence of a bistratified granular infractectal layer in the subgenus Aculeiferum but not in the section Filicinae.

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