Abstract
Flowers of Ludwigia elegans present a set of generalized characteristics attracting visitors of several insect taxa, however, they strongly depend on bees for pollination. Bees of 32 species were observed visiting L. elegans flowers of which Tetraglossula bigamica is considered an efficient, oligolectic, and specialized pollinator. This bee has stiff, long and simple hairs on the scopae. The daily and annual activity patterns of T. bigamica are synchronized to the flower phenology of L. elegans. Other bee species can pollinate the flowers if their body size is large enough to contact the stigma during the harvest.
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