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Poplars ( Populus  sp.) and willows ( Salix  sp.) are well known woody plants common throughout the northern hemisphere, both with fully sequenced genomes. They bear compact unisexual inflorescences known as “catkins.” Closely related genera of the “salicoid clade” within the family Salicaceae include the Asian genera  Bennettiodendron ,  Idesia ,  Itoa ,  Poliothyrsis , and  Carrierea  and the Central American genera  Olmediella  and  Macrohasseltia . Like willow and poplar, most of these genera are dioecious, but unlike willow and poplar they generally have loosely branched panicles rather than catkins, and less highly reduced flowers. However, the early developing inflorescences of  Carrierea  and  Idesia  show similarities to catkins which suggest possible pathways by which the salicoid catkin may have evolved.

Evolution of Catkins: Inflorescence Morphology of Selected Salicaceae in an Evolutionary and Developmental Context