Displaying 1 - 25 out of 242 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Colubrina californica I.M.Johnst. | I. M. Johnston 3496 | 08 May 1921 | Mexico | Baja California | Las Animas Bay | — |
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| Rosa johnstonii Rydb. | I. M. Johnston 2130 | 25 Aug 1918 | United States of America | California | San Bernardino Co. Near Upland | type |
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| Rosa johnstonii Rydb. | I. M. Johnston 2054 | 04 Jul 1918 | United States of America | California | San Bernardino Co. Red Hill,… | type |
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| Cercidium praecox (Ruiz & Pav.) Harms | I. M. Johnston 3592 | 11 May 1921 | Mexico | — | Tortuga Island, Baja California. | — |
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| Haplopappus arenarius var. incisifolius I.M.Johnst. | I. M. Johnston 3529 | 09 May 1921 | United States of America | California | South San Lorenzo Island | isotype |
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| Hydrocoleum codicola Setch. & N.L.Gardner | I. M. Johnston [8a] | [Jun] | Mexico | Baja California Sur | San Marcos Island | probable isotype |
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| Carex stenoptera Mack. | I. M. Johnston 1505 | 31 Jul 1917 | United States of America | California | Ice House Cañon, San Antonio… | holotype |
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| Cercidium molle I.M.Johnst. | I. M. Johnston 3877 | 26 May 1921 | Mexico | — | Agua Verde Bay, Baja California. | isotype |
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| Houstonia gracillima I.M.Johnst. | I. M. Johnston 3927 | 27 May 1921 | Mexico | — | Gulf of California. San Diego… | isotype |
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| Peniocereus johnstonii Britton & Rose | I. M. Johnston 3940 | 28 May 1921 | Mexico | Baja California | San Josef Island; Several miles… | type |
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| Peniocereus johnstonii Britton & Rose | I. M. Johnston 3940 | 28 May 1921 | Mexico | Baja California | San Josef Island; Several miles… | type |
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| Eriogonum galioides I.M.Johnst. | I. M. Johnston 3315 | 28 Apr 1921 | Mexico | — | Gulf of California; San Luis… | isotype |
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| Sartwellia humilis I.M.Johnst. | I. M. Johnston 7634 | 12 Sep 1938-13 Sep 1938 | Mexico | Coahuila | Road from state boundary, near… | type |
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| Eriogonum microthecum var. johnstonii Reveal | I. M. Johnston 1726 | 16 Sep 1917 | United States of America | California | San Antonio Mountains; west spur… | isotype |
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| Neomammillaria evermanniana Britton & Rose | I. M. Johnston 4058 | 1921 | Mexico | Baja California | Ceralbo Island | isotype |
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| Jacquemontia eastwoodiana I.M.Johnst. | I. M. Johnston 3742 | 17 May 1921 | Mexico | — | Gulf of California: Ildefouso Island,… | isotype |
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| Hofmeisteria filifolia I.M.Johnst. | I. M. Johnston 3418 | 03 May 1921 | Mexico | — | Angel de la Guardia Island:… | isotype |
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| Neomammillaria johnstonii Britton & Rose | I. M. Johnston 4373 | 1921 | Mexico | Sonora | San Carlos Bay | type |
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| Neomammillaria johnstonii Britton & Rose | I. M. Johnston 3542 | — | Mexico | Baja California | San Lorenzo Island | possible type |
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| Helianthus nuttallii subsp. parishii (A.Gray) Heiser | I. M. Johnston s.n. | 02 Sep 1924 | United States of America | California | San Bernardino Co. 2 miles… | — |
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| Neomammillaria cerralboa Britton & Rose | I. M. Johnston 4038 | 06 Jun 1921 | Mexico | — | Gordas Point, 0.5 mile north;… | holotype |
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| Atriplex reptans I.M.Johnst. | I. M. Johnston 1081 | 09 Sep 1940 | Mexico | Coahuila | Along road from San Vicente… | holotype |
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| Coldenia canescens var. subnuda I.M.Johnst. | I. M. Johnston 3731 | 16 May 1921 | Mexico | — | San Nicholas Bay, Baja California | isotype |
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| Acacia brandegeana I.M.Johnst. | I. M. Johnston 3881 | 1921 | Mexico | Baja California | Agua Verde Bay | isotype |
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| Acacia brandegeana I.M.Johnst. | I. M. Johnston 3881 | 1921 | Mexico | Baja California | Agua Verde Bay | isotype |
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