| 
                                    Penstemon moffatii Eastw.
                                 | 
                                E. B. Payson 257 | 
                                27 Apr 1914 | 
                                United States of America | 
                                Colorado | 
                                Naturita | 
                                photo of type | 
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                                | 
                                    Penstemon paysonii Pennell
                                 | 
                                E. B. Payson 257 | 
                                27 Apr 1914 | 
                                United States of America | 
                                Colorado | 
                                Montrose Co. Naturita | 
                                isotype | 
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                                | 
                                    Puccinia thlaspeos C.Schub.
                                 | 
                                E. B. Payson 291 | 
                                11 May 1914 | 
                                United States of America | 
                                Colorado | 
                                Montrose Co. | 
                                — | 
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                                | 
                                    Puccinia thlaspeos C.Schub.
                                 | 
                                E. B. Payson 291 | 
                                11 May 1914 | 
                                United States of America | 
                                Colorado | 
                                Montrose Co. | 
                                — | 
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                                | 
                                    Penstemon cyanocaulis Payson
                                 | 
                                E. B. Payson 348 | 
                                25 May 1914 | 
                                United States of America | 
                                Colorado | 
                                Montrose Co. Naturita, southwestern Colorado | 
                                isotype | 
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                                | 
                                    Penstemon retrorsus Payson
                                 | 
                                E. B. Payson 673 | 
                                15 Jun 1915 | 
                                United States of America | 
                                Colorado | 
                                Near Montrose | 
                                holotype | 
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                                | 
                                    Penstemon retrorsus Payson
                                 | 
                                E. B. Payson 673 | 
                                15 Jun 1915 | 
                                United States of America | 
                                Colorado | 
                                Near Montrose | 
                                isotype | 
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                                | 
                                    Penstemon ophianthus Pennell
                                 | 
                                E. B. Payson 1003 | 
                                — | 
                                United States of America | 
                                Colorado | 
                                Montrose Co. Naturita | 
                                — | 
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                                | 
                                    Penstemon comarrhenus A.Gray
                                 | 
                                E. B. Payson 1057 | 
                                11 Jul 1917 | 
                                United States of America | 
                                Colorado | 
                                Bostwick Park, 15 miles east… | 
                                — | 
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                                | 
                                    Castilleja sulphurea Rydb.
                                 | 
                                E. B. Payson 1072 | 
                                14 Jul 1917 | 
                                United States of America | 
                                Colorado | 
                                Delta Co. | 
                                — | 
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                                | 
                                    Castilleja occidentalis Torr.
                                 | 
                                E. B. Payson 1099 | 
                                26 Jul 1917 | 
                                United States of America | 
                                Colorado | 
                                Dolores Co. just above timberline,… | 
                                — | 
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                                | 
                                    Castilleja rhexifolia Rydb.
                                 | 
                                E. B. Payson 1100 | 
                                26 Jul 1917 | 
                                United States of America | 
                                Colorado | 
                                Dolores Co. Subalpine near Rico | 
                                — | 
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                                | 
                                    Penstemon linarioides subsp. coloradoensis (A.Nelson) D.D.Keck
                                 | 
                                E. B. Payson 1129 | 
                                30 Jul 1917 | 
                                United States of America | 
                                Colorado | 
                                Mesa Verde, south of Cortez | 
                                — | 
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                                | 
                                    Senecio integerrimus var. exaltatus (Nutt.) Cronquist
                                 | 
                                E. B. Payson 1682 | 
                                17 Jun 1920 | 
                                United States of America | 
                                Wyoming | 
                                Carbon Co. | 
                                — | 
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                                | 
                                    Erigeron engelmannii A.Nelson var. engelmannii
                                 | 
                                E. B. Payson 1684 | 
                                17 Jun 1920 | 
                                United States of America | 
                                Wyoming | 
                                Carbon Co. Hanna; dry hills | 
                                — | 
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                                | 
                                    Castilleja chromosa A.Nelson
                                 | 
                                E. B. Payson 1685 | 
                                17 Jun 1920 | 
                                United States of America | 
                                Wyoming | 
                                Carbon Co. | 
                                — | 
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                                | 
                                    Agoseris parviflora (Nutt.) D.Dietr.
                                 | 
                                E. B. Payson 1686 | 
                                17 Jun 1920 | 
                                United States of America | 
                                Wyoming | 
                                Carbon Co. Dry Hills, Hanna | 
                                — | 
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                                | 
                                    Trifolium gymnocarpon Nutt. ex Torr. & A.Gray
                                 | 
                                E. B. Payson 1687 | 
                                17 Jun 1920 | 
                                United States of America | 
                                Wyoming | 
                                Carbon Co. | 
                                — | 
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                                | 
                                    Cryptantha flavoculata (A.Nelson) Payson
                                 | 
                                E. B. Payson 1689 | 
                                17 Jun 1920 | 
                                United States of America | 
                                Wyoming | 
                                Carbon Co. | 
                                — | 
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                                | 
                                    Lomatium foeniculaceum var. macdougalii (J.M.Coult. & Rose) Cronquist
                                 | 
                                E. B. Payson 1690 | 
                                17 Jun 1920 | 
                                United States of America | 
                                Wyoming | 
                                Carbon Co. | 
                                — | 
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                                | 
                                    Penstemon cleburnei M.E.Jones
                                 | 
                                E. B. Payson 1691 | 
                                17 Jun 1920 | 
                                United States of America | 
                                Wyoming | 
                                Carbon Co. Hanna | 
                                — | 
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                                | 
                                    Machaeranthera glabriuscula (Nutt.) Cronquist & D.D.Keck
                                 | 
                                E. B. Payson 1692 | 
                                17 Jun 1920 | 
                                United States of America | 
                                Wyoming | 
                                Carbon Co. | 
                                — | 
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                                | 
                                    Astragalus simplicifolius (Nutt.) A.Gray
                                 | 
                                E. B. Payson 1694 | 
                                17 Jun 1920 | 
                                United States of America | 
                                Wyoming | 
                                Carbon Co. Hanna | 
                                — | 
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                                | 
                                    Descurainia sophia (L.) Webb ex Prantl
                                 | 
                                E. B. Payson 1695 | 
                                17 Jun 1920 | 
                                United States of America | 
                                Wyoming | 
                                Carbon Co. | 
                                — | 
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                                | 
                                    Symphoricarpos oreophilus var. utahensis (Rydb.) A.Nelson
                                 | 
                                E. B. Payson 1696 | 
                                17 Jun 1920 | 
                                United States of America | 
                                Wyoming | 
                                Carbon Co. | 
                                — | 
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                                | 
                                    Prunus virginiana L.
                                 | 
                                E. B. Payson 1698 | 
                                17 Jun 1920 | 
                                United States of America | 
                                Wyoming | 
                                Carbon Co. | 
                                — | 
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                                | 
                                    Physaria acutifolia Rydb.
                                 | 
                                E. B. Payson 1701 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs | 
                                — | 
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                                | 
                                    Astragalus lentiginosus var. chartaceus M.E.Jones
                                 | 
                                E. B. Payson 1703 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Caribou Co. Soda Springs | 
                                — | 
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                                | 
                                    Lepidium montanum Nutt. ex Torr. & A.Gray var. montanum
                                 | 
                                E. B. Payson 1704 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda springs | 
                                — | 
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                                | 
                                    Chaenactis douglasii var. achilleifolia (Hook. & Arn.) A.Nelson
                                 | 
                                E. B. Payson 1705 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs. | 
                                — | 
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                                | 
                                    Castilleja flava S.Watson
                                 | 
                                E. B. Payson 1706 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda springs | 
                                — | 
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                                | 
                                    Arnica sororia Greene
                                 | 
                                E. B. Payson 1707 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Caribou Co. Soda Springs | 
                                — | 
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                                | 
                                    Packera multilobata (Torr. & A.Gray) W.A.Weber & Á.Löve
                                 | 
                                E. B. Payson 1708 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs. | 
                                — | 
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                                | 
                                    Penstemon procerus Graham var. procerus
                                 | 
                                E. B. Payson 1709 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs | 
                                — | 
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                                | 
                                    Pyrrocoma uniflora (Hook.) Greene var. uniflora
                                 | 
                                E. B. Payson 1711 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs. | 
                                — | 
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                                    Dodecatheon pulchellum (Raf.) Merr.
                                 | 
                                E. B. Payson 1712 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs. | 
                                — | 
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                                | 
                                    Lappula echinata Gilib.
                                 | 
                                E. B. Payson 1713 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs. | 
                                — | 
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                                | 
                                    Lappula redowskii (Hornem.) Greene var. redowskii
                                 | 
                                E. B. Payson 1714 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs. Along… | 
                                — | 
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                                | 
                                    Viola nephrophylla Greene
                                 | 
                                E. B. Payson 1715 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs. | 
                                — | 
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                                | 
                                    Viola adunca Sm. f. adunca
                                 | 
                                E. B. Payson 1716 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs. | 
                                — | 
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                                | 
                                    Delphinium nuttallianum Pritz.
                                 | 
                                E. B. Payson 1717 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs | 
                                — | 
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                                | 
                                    Sisyrinchium idahoense var. occidentale (E.P.Bicknell) D.M.Hend.
                                 | 
                                E. B. Payson 1721 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs. | 
                                — | 
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                                | 
                                    Arabis nuttallii (Kuntze) B.L.Rob.
                                 | 
                                E. B. Payson 1722 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs | 
                                — | 
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                                | 
                                    Salix brachycarpa Nutt. var. brachycarpa
                                 | 
                                E. B. Payson 1723 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs. Around… | 
                                — | 
                                 | 
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                                | 
                                    Erigeron compositus var. glabratus Macoun
                                 | 
                                E. B. Payson 1724 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs, dry… | 
                                — | 
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                                | 
                                    Amsinckia micrantha Suksd.
                                 | 
                                E. B. Payson 1725 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs. Along… | 
                                — | 
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                                | 
                                    Cymopterus longipes S.Watson
                                 | 
                                E. B. Payson 1726 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. Soda Springs | 
                                — | 
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                                | 
                                    Erysimum inconspicuum (S.Watson) MacMill.
                                 | 
                                E. B. Payson 1727 | 
                                18 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bannock Co. | 
                                — | 
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                                | 
                                    Thelypodium milleflorum A.Nelson
                                 | 
                                E. B. Payson 1728 | 
                                19 Jun 1920 | 
                                United States of America | 
                                Idaho | 
                                Bonneville Co. Idaho Falls. | 
                                — | 
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                                | 
                                    Penstemon aridus Rydb.
                                 | 
                                E. B. Payson 1741 | 
                                20 Jun 1920 | 
                                United States of America | 
                                Montana | 
                                Beaverhead Co. Armstead | 
                                — | 
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