| 
                                    Penstemon calycosus Small
                                 | 
                                E. P. Bicknell s.n. | 
                                14 May 1894-17 May 1894 | 
                                United States of America | 
                                Tennessee | 
                                Davidson Co. Nashville | 
                                holotype | 
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                                | 
                                    Penstemon calycosus Small
                                 | 
                                E. P. Bicknell s.n. | 
                                14 May 1894-17 May 1894 | 
                                United States of America | 
                                Tennessee | 
                                Davidson Co. Nashville | 
                                isotype | 
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                                    Penstemon calycosus Small
                                 | 
                                E. T. Wherry 13693 | 
                                07 Sep 1927 | 
                                United States of America | 
                                Kentucky | 
                                Anderson Co. Salt River, 5… | 
                                — | 
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                                    Penstemon calycosus Small
                                 | 
                                E. T. Wherry s.n. | 
                                05 Jun 1931 | 
                                United States of America | 
                                Indiana | 
                                Greene Co. 3 miles west… | 
                                — | 
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                                    Penstemon calycosus Small
                                 | 
                                F. Bartley 275 | 
                                07 Jun 1936 | 
                                United States of America | 
                                Illinois | 
                                Jackson Co. Liberty [Township?]; Low… | 
                                — | 
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                                    Penstemon calycosus Small
                                 | 
                                F. J. Hermann 6618 | 
                                14 Jun 1935 | 
                                United States of America | 
                                Indiana | 
                                Gibson Co. 8 miles west… | 
                                — | 
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                                    Penstemon calycosus Small
                                 | 
                                F. S. Earle 753 | 
                                23 May 1902 | 
                                United States of America | 
                                Illinois | 
                                Union Co. Cobden | 
                                — | 
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                                | 
                                    Penstemon calycosus Small
                                 | 
                                F. T. McFarland 97 | 
                                08 Jun 1945 | 
                                United States of America | 
                                Kentucky | 
                                Allen Co. 5 miles west… | 
                                — | 
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                                | 
                                    Penstemon calycosus Small
                                 | 
                                F. W. Johnson 1891 | 
                                05 Jul 1915 | 
                                United States of America | 
                                Illinois | 
                                Romeo Island, Des Plaines River,… | 
                                — | 
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                                | 
                                    Penstemon calycosus Small
                                 | 
                                F. W. Johnson s.n. | 
                                07 Jun 1914 | 
                                United States of America | 
                                Indiana | 
                                Miller | 
                                — | 
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                                    Penstemon calycosus Small
                                 | 
                                F. W. Pennell 362 | 
                                17 Jun 1918 | 
                                United States of America | 
                                New York | 
                                Bronx Co. Nursery, New York… | 
                                — | 
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                                    Penstemon calycosus Small
                                 | 
                                F. W. Pennell 362 | 
                                17 Jun 1918 | 
                                United States of America | 
                                New York | 
                                Bronx Co. Herbaceous Grounds, New… | 
                                — | 
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                                    Penstemon calycosus Small
                                 | 
                                F. W. Pennell 9746 | 
                                27 May 1917 | 
                                United States of America | 
                                Alabama | 
                                Morgan Co. | 
                                — | 
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                                    Penstemon calycosus Small
                                 | 
                                F. W. Pennell 9756 | 
                                27 May 1917 | 
                                United States of America | 
                                Alabama | 
                                Morgan Co. Cedar Lake | 
                                — | 
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                                    Penstemon calycosus Small
                                 | 
                                F. W. Pennell 9772 | 
                                28 May 1917 | 
                                United States of America | 
                                Alabama | 
                                Madison Co. Monte Sano | 
                                — | 
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                                    Penstemon calycosus Small
                                 | 
                                F. W. Pennell 9772 | 
                                28 May 1917 | 
                                United States of America | 
                                Alabama | 
                                Madison Co. Monte Sano | 
                                — | 
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                                    Penstemon calycosus Small
                                 | 
                                F. W. Pennell 9780 | 
                                28 May 1917 | 
                                United States of America | 
                                Alabama | 
                                Madison Co. Monte Sano | 
                                — | 
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                                    Penstemon calycosus Small
                                 | 
                                F. W. Pennell 9787 | 
                                29 May 1917 | 
                                United States of America | 
                                Georgia | 
                                Dade Co. Hooker | 
                                — | 
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                                    Penstemon calycosus Small
                                 | 
                                F. W. Pennell 11774 | 
                                19 Jun 1923 | 
                                United States of America | 
                                Indiana | 
                                Jefferson Co. Hanover | 
                                — | 
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                                    Penstemon calycosus Small
                                 | 
                                F. W. Pennell 11791 | 
                                20 Jun 1923 | 
                                United States of America | 
                                Indiana | 
                                Clark Co. 3-4 miles northeast… | 
                                — | 
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                                    Penstemon calycosus Small
                                 | 
                                F. W. Pennell 21387 | 
                                11 May 1938 | 
                                United States of America | 
                                Tennessee | 
                                Humphreys Co. Route 70, east… | 
                                — | 
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                                | 
                                    Penstemon calycosus Small
                                 | 
                                G. L. Webster 7312 | 
                                20 May 1961 | 
                                United States of America | 
                                Indiana | 
                                Posey Co. 0.5 mile west… | 
                                — | 
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                                | 
                                    Penstemon calycosus Small
                                 | 
                                G. N. Jones 11899 | 
                                04 Jul 1940 | 
                                United States of America | 
                                Illinois | 
                                Jackson Co. 5 miles south… | 
                                — | 
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                                | 
                                    Penstemon calycosus Small
                                 | 
                                G. S. Crowl s.n. | 
                                16 Aug 1937 | 
                                United States of America | 
                                Ohio | 
                                Ross Co. | 
                                — | 
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                                | 
                                    Penstemon calycosus Small
                                 | 
                                H. A. Gleason 8855 | 
                                24 Jun 1940 | 
                                United States of America | 
                                Kentucky | 
                                Along Route 80, 10 miles… | 
                                — | 
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