References

For Populus

Eckenwalder, J.E. 1977. North American cottonwoods (Populus, Salicaceae) of sections Abaso and Aigeiros. J. Arnold Arb. 58: 193-208. Google Scholar

Eckenwalder, J.E. 1984. Natural intersectional hybrids between North American species of Populus (Salicaceae) in sections Aigeiros and Tacamahaca. II. Taxonomy. Can. J. Bot. 62: 325-335. Google Scholar

Eckenwalder, J.E. 1996. Systematics and evolution of Populus. In Stettler, R.F., H.D. Bradshaw, Jr., P.E. Heilman, and T.M. Hinckley, eds. Biology of Populus and its implications for management and conservation. NRC Research Press, Ottawa. Google Scholar

Eckenwalder, J.E. 2010. Populus. In Flora of North America Editorial Committee. 2010. Flora of North America north of Mexico. Volume 7, Magnoliophyta: Brassicaceae to Salicaceae. Oxford Univ. Press, New York, NY. 797 pp. Google Scholar

Hamzeh, M., and S. Dayanandan. 2004. Phylogeny of Populus (Salicaceae) based on nucleotide sequences of chloroplast trnT-trnF region and nuclear rDNA. Amer. J. Botany 91: 1398-1408. Google Scholar