MARTA CACCAVARI, ELIZABETH DOME; AN ACCOUNT OF MORPHOLOGICAL AND STRUCTURAL CHARACTERIZATION OF AMERICAN MIMOSOIDEAE POLLEN. PART I: TRIBE ACACIEAE. Palynology ; 24 (1): 231–248. doi: https://doi.org/10.2113/0240231
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.