Date of Award
Master of Arts (M.A.)
The genus Polygonum belongs to the family of plants, the Polygonaceae, which includes about forty genera and seven hundred and fifty species. About two hundred end seventy-five of these belong within Polygonum. Scientists have also found distinctly recognizable fossil Polygonums which date from prehistoric ages. Dr. F. H. Knowlton¹ of the U. S. National Museum has listed twelve species which have been found in fossil form. While studying collection of Colorado fossil plants in the Geological Tunes et Columbia College, Small discovered a remarkably distinct Polygonum belonging to the subgenus Persicaria.
McCarthy, Helen Keech. (1932). The Distribution and Economic Significance of he Genus Polygonum in Sacramento County of California. University of the Pacific, Thesis. https://scholarlycommons.pacific.edu/uop_etds/4074