Hasseltia is a genus of flowering plants in the family Salicaceae. It contains four species of small to medium-sized trees native to the neotropics, ranging from Mexico south to Brazil and Bolivia.Alford, M.H. 2006. A new species of Hasseltia (Salicaceae) from Costa Rica and Panama. Brittonia 58(3): 277-284. The genus is named for the Dutch physician and botanist Johan Conrad van Hasselt.
Hasseltia is unique among Salicaceae in that the species have pseudo-axile placentation, compound umbellate inflorescences, and a pair of glands embedded in the base of the leaf blades. Formerly placed in the heterogeneous family Flacourtiaceae,Sleumer, H.O. 1980. Flacourtiaceae. Flora Neotropica 22: 1-499. Hasseltia is now classified in Salicaceae, along with close relatives Pleuranthodendron and Macrothumia, with which they are commonly confused.Alford, M. H. 2003. Claves para los géneros de Flacourtiaceae de Perú y del Nuevo Mundo. Arnaldoa 10: 19-38.Gentry, A. H. 1993. A Field Guide to the Families and Genera of Woody Plants of Northwest South America (Colombia, Ecuador, Peru). Chicago: University of Chicago Press.
Known species The following species are accepted by World Flora Online and Plants of the World Online: Hasseltia allenii Hasseltia crassa Hasseltia floribunda Hasseltia guatemalensis Hasseltia laterifolia Hasseltia yanachagaensis
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