References
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. 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