An inflorescence (PO:0009049), with a monopodial growth habit, which at anthesis is composed of indeterminate first order inflorescence axis (PO:0025104) and sessile (PATO:0001436), unisexual flowers (PO:0009046) that are each subtended by conspicuous (PATO:0000463) inflorescence bracts (PO:0009054).
Examples include poplars (including Populus trichocarpa, Salicaceae) and birches (Betula spp., Betulaceae). Catkin inflorescences are often pendulate.
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