| 
                                    Penstemon wilcoxii Rydb.
                                 | 
                                T. G. Call 104 | 
                                18 Jun 1949 | 
                                United States of America | 
                                Montana | 
                                Missoula Co. Lolo Creek at… | 
                                — | 
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                                | 
                                    Penstemon albertinus Greene
                                 | 
                                T. G. Call 106 | 
                                17 Jun 1949 | 
                                United States of America | 
                                Montana | 
                                Missoula Co. Pattee Canyon. 2… | 
                                — | 
                                 | 
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                                | 
                                    Penstemon albertinus Greene
                                 | 
                                T. G. Call 107 | 
                                13 Jun 1949 | 
                                United States of America | 
                                Montana | 
                                Powell Co. 1 mile west… | 
                                — | 
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                                | 
                                    Penstemon eriantherus Pursh
                                 | 
                                T. G. Call 108 | 
                                07 Jun 1949 | 
                                United States of America | 
                                Wyoming | 
                                Albany Co. 1 mile east… | 
                                — | 
                                 | 
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                                | 
                                    Penstemon virens Pennell ex Rydb.
                                 | 
                                T. G. Call 111 | 
                                02 Jun 1949 | 
                                United States of America | 
                                Wyoming | 
                                Albany Co. Fox Creek | 
                                — | 
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                                | 
                                    Penstemon nitidus var. polyphyllus (Pennell) Cronquist
                                 | 
                                T. G. Call 263 | 
                                30 May 1950 | 
                                United States of America | 
                                Montana | 
                                Missoula Co. In grass by… | 
                                — | 
                                 | 
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                                | 
                                    Penstemon eriantherus Pursh
                                 | 
                                T. G. Call 286 | 
                                01 Jun 1950 | 
                                United States of America | 
                                Montana | 
                                Missoula Co. Northeast Side Waterworks… | 
                                — | 
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                                | 
                                    Penstemon albertinus Greene
                                 | 
                                T. G. Call 293 | 
                                02 Jun 1950 | 
                                United States of America | 
                                Montana | 
                                Missoula Co. South Central Missoula… | 
                                — | 
                                 | 
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                                | 
                                    Penstemon albertinus Greene
                                 | 
                                T. G. Call 296 | 
                                02 Jun 1950 | 
                                United States of America | 
                                Montana | 
                                Missoula Co. South Central Missoula… | 
                                — | 
                                 | 
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                                | 
                                    Penstemon speciosus Douglas
                                 | 
                                T. G. Call 306 | 
                                09 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Lincoln Co. On U.S. 2,… | 
                                — | 
                                 | 
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                                | 
                                    Penstemon speciosus Douglas
                                 | 
                                T. G. Call 307 | 
                                09 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Grant Co.-Douglas Co. line. 1… | 
                                — | 
                                 | 
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                                | 
                                    Penstemon gairdneri Hook. var. gairdneri
                                 | 
                                T. G. Call 313 | 
                                09 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Douglas Co. On U.S. 2,… | 
                                — | 
                                 | 
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                                | 
                                    Penstemon speciosus Douglas
                                 | 
                                T. G. Call 314 | 
                                09 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Douglas Co. On U.S. 2,… | 
                                — | 
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                                | 
                                    Penstemon fruticosus (Pursh) Greene var. fruticosus
                                 | 
                                T. G. Call 316 | 
                                09 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Chelan Co. U.S. 2, 1… | 
                                — | 
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                                | 
                                    Penstemon pruinosus Douglas ex Lindl.
                                 | 
                                T. G. Call 317 | 
                                09 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Chelan Co. U.S. 2, 1… | 
                                — | 
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                                | 
                                    Penstemon serrulatus Menzies ex Sm.
                                 | 
                                T. G. Call 324 | 
                                13 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Jefferson Co. U.S. 101, 0.7… | 
                                — | 
                                 | 
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                                | 
                                    Penstemon fruticosus (Pursh) Greene var. fruticosus
                                 | 
                                T. G. Call 326 | 
                                14 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Yakima Co. U.S. 410. 10… | 
                                — | 
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                                | 
                                    Penstemon humilis A.Gray var. humilis
                                 | 
                                T. G. Call 327 | 
                                14 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Yakima Co. U.S. 410, 18… | 
                                — | 
                                 | 
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                                | 
                                    Penstemon speciosus Douglas
                                 | 
                                T. G. Call 328 | 
                                14 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Yakima Co. U.S. 410, 7… | 
                                — | 
                                 | 
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                                | 
                                    Penstemon speciosus Douglas
                                 | 
                                T. G. Call 330 | 
                                14 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Yakima Co. U.S. 97 near… | 
                                — | 
                                 | 
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                                | 
                                    Penstemon humilis A.Gray var. humilis
                                 | 
                                T. G. Call 331 | 
                                14 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Kittitas Co. U.S. 10, 15.1… | 
                                — | 
                                 | 
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                                | 
                                    Penstemon pruinosus Douglas ex Lindl.
                                 | 
                                T. G. Call 333 | 
                                15 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Adams Co. U.S. 10, 11… | 
                                — | 
                                 | 
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                                | 
                                    Penstemon pruinosus Douglas ex Lindl.
                                 | 
                                T. G. Call 335 | 
                                15 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Adams Co. U.S. Highway 10,… | 
                                — | 
                                 | 
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                                | 
                                    Penstemon humilis A.Gray var. humilis
                                 | 
                                T. G. Call 336 | 
                                15 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Adams Co. U.S. 10, 18.9… | 
                                — | 
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                                | 
                                    Penstemon procerus Graham var. procerus
                                 | 
                                T. G. Call 337 | 
                                15 Jun 1950 | 
                                United States of America | 
                                Washington | 
                                Spokane Co. U.S. 10, 7.7… | 
                                — | 
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