The pollen morphology of seven species of Euphorbiaceae occurring in the State of Santa Catarina, were examined: Actinostemon concolor, Hieronima alchorneoides, Maprounea brasiliensis, Pachystroma longifolium, Pausandra morisiana, Sapium glandulosum and Sebastiania argutidens. Except for Pausandra morisiana, all species have pollen grains in monads, isopolar, small to medium, radial symmetry, 3-colporate, oblate-spheroidal to prolate, and with a microreticulate ornamentation. Pollen grains of Pausandra morisiana follow the Croton-pattern. The morphometric data showed that Hieronima alchorneiodes pollen grains present the equatorial axis shorter than the other specimens studied. Pachystroma longifolium is the only species that shows a nexine thicker than the sexine, which characterizes pollen grains more resistant to the fossilization processes.
Euphorbiaceae; Palynotaxonomy; pollen grainz
