Pollen morphology and flower visitors of Leiotulus aureus (Sm.) Pimenov & Ostr. (Apiaceae)

The pollen grains of Leiotulus aureus (syn. Malabaila aurea (Sm.) Boiss.) were examined by light and scanning electron microscopy in order to contribute to the taxonomical and melissopalynological studies of the species. Flower visitors have also been observed and analyzed aiming at the clarification of some pollination aspects including the species contribution to bee pasture. The pollen grains of L. aureus are isopolar, radially symmetrical, medium to large in size, tri- colporate and perprolate. They are slightly equatorially constricted with obtuse polar caps and triangular in polar view. The sculpturing pattern is rugulate-microperforate. With regard to flower visitors, the following pollination types oc- curred: melittophily, myophily and sapromyophily and cantharophily. Some insects attracted by L. aureus cannot be con-sidered pollinators but casual visitors. The flowers were the most frequently visited by honey bees during midday.

Automated summary

This study examined the pollen grains of Leiotulus aureus using light and scanning electron microscopy, contributing to the taxonomical and melissopalynological studies of the species. Flower visitors and their pollination types were also observed and analyzed, with a focus on the species' contribution to bee pasture. The pollen grains of L. aureus were found to be isopolar, radially symmetrical, medium to large in size, and had a rugulate-microperforate sculpturing pattern. Honey bees were the most frequent visitors of the flowers, mainly during midday.