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Filters: Keyword is VARIATION and Author is Barnes, Burton Verne [Clear All Filters]
Natural variation and clonal development of Populus tremuloides and P. grandidentata in northern lower Michigan. Doctor of Philosophy:318pp... 1959.
Hybrid aspens in the lower peninsula of Michigan. Rhodora. 63(755):311-324.. 1961.
Natural variation and delineation of clones of Populus tremuloides and P. grandidentata in northern lower Michigan. Silvae Genetica. 18:130-142.. 1969.
Phenotypic variation of Chinese aspens and their relationships to similar taxa in Europe and North America. Canadian Journal of Botany. 71:799-815.. 1993.