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Maurice E. Demeritt, Jr.
Poplar hybrids (Populus spp.) are the result of natural and manmade crosses among poplar species. The genus is further divided into five sections of which four are represented in North America: Leuce (aspen type), to which P. grandidentata and P. tremuloides (bigtooth aspen and quaking aspen) belong; Aigeiros (cottonwood or poplar type), to which P. deltoides, P. sargentii, P. fremontii, and P. wislizeni (eastern, plains, Fremont, and Rio Grande cottonwood) belong; Tacamahaca (balsam poplar type), to which P. balsamifera, R trichocarpa, and P. angustifolia (balsam poplar, black, and narrowleaf cottonwood) belong, and Leucoides (swamp poplar type), to which P. heterophylla belongs. P. balsamifera subsp. trichocarpa has been reported as the correct status of P. trichocarpa (44).