| 
                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                Dr. L. Watson s.n. | 
                                08 Jul 1874 | 
                                United States of America | 
                                Kansas | 
                                Ellis Co. | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                J. S. Newberry s.n. | 
                                1883 | 
                                United States of America | 
                                — | 
                                Upper Missouri River | 
                                syntype | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                P. A. Rydberg 1022 | 
                                17 Jun 1892 - 08 Aug 1892 | 
                                United States of America | 
                                South Dakota | 
                                Fall River Co. Black Hills | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                C. L. Shear 4 | 
                                Apr 1894 | 
                                United States of America | 
                                Kansas | 
                                Osborne Co. within a radius… | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                C. L. Shear 4 | 
                                Apr 1894 | 
                                United States of America | 
                                Kansas | 
                                Osborne Co. within a radius… | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                C. L. Shear 4 | 
                                Apr 1894 | 
                                United States of America | 
                                Kansas | 
                                Osborne Co. within a radius… | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                C. L. Shear 4 | 
                                Apr 1894 | 
                                United States of America | 
                                Kansas | 
                                Osborne Co. within a radius… | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                C. L. Shear 4 | 
                                Apr 1894 | 
                                United States of America | 
                                Kansas | 
                                Osborne Co. Within a radius… | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                J. B. Norton 513 | 
                                11 Apr 1895 | 
                                United States of America | 
                                Kansas | 
                                Riley Co. | 
                                — | 
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                                | 
                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                J. B. Leiberg 1619 | 
                                28 Aug 1895 | 
                                United States of America | 
                                Montana | 
                                Region of the Coeur d’Alene… | 
                                — | 
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                                | 
                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                J. B. Norton 513a | 
                                02 Oct 1895 | 
                                United States of America | 
                                Kansas | 
                                Riley Co. | 
                                — | 
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                                | 
                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                E. N. Plank s.n. | 
                                13 Aug 1896 | 
                                United States of America | 
                                Nebraska | 
                                Crawford. | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                D. T. MacDougal 112 | 
                                08 Jun 1901 | 
                                United States of America | 
                                Nebraska | 
                                White River, near Crawford | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                S. S. Visher 2116 | 
                                15 Jul 1911 | 
                                United States of America | 
                                South Dakota | 
                                Oglala Lakota Co. Pine Ridge… | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                S. S. Visher 2270 | 
                                15 Aug 1911 | 
                                United States of America | 
                                South Dakota | 
                                Bennett Co. Sandhills near La… | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                J. N. Rose 17090 | 
                                19 Sep 1912 | 
                                United States of America | 
                                Kansas | 
                                vicinity of Syracuse | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                J. Hartling 41183 | 
                                15 Aug 1916 | 
                                United States of America | 
                                New York | 
                                Bronx Co. New York Botanical… | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                H. E. Hayward 470 | 
                                16 Aug 1926 | 
                                United States of America | 
                                South Dakota | 
                                Fall River Co. Hot Brook… | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                E. J. Palmer 36087 | 
                                07 Jun 1929 | 
                                United States of America | 
                                South Dakota | 
                                Lyman Co. Along Missouri River,… | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                E. J. Palmer 37121 | 
                                10 Jun 1929 | 
                                United States of America | 
                                South Dakota | 
                                Lawrence Co. Boulder Canyon, near… | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                E. J. Palmer 37228 | 
                                13 Jun 1929 | 
                                United States of America | 
                                South Dakota | 
                                Lawrence Co. near Piedmont | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                P. A. Rydberg 761 | 
                                09 Jul 1929 | 
                                United States of America | 
                                Kansas | 
                                Clark Co. Sandhills on Cimarron… | 
                                — | 
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                                | 
                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                P. A. Rydberg 1027 | 
                                17 Jul 1929 | 
                                United States of America | 
                                Kansas | 
                                Scott Co. Badlands, near Bilby's… | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                E. J. Palmer 38154 | 
                                01 Aug 1930 | 
                                United States of America | 
                                Kansas | 
                                Wallace Co. About spring and… | 
                                — | 
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                                    Populus deltoides var. occidentalis Rydb.
                                 | 
                                H. Hapeman s.n. | 
                                30 May 1931 | 
                                United States of America | 
                                Nebraska | 
                                Kearney Co. | 
                                — | 
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