Displaying 1 - 50 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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| Coldenia cuspidata I.M.Johnst. | I. M. Johnston 3617 | 12 May 1921 | Mexico | — | Lower California: San Marcos Island | isotype |
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| Sphaeralcea ambigua subsp. versicolor Kearney | I. M. Johnston 4214 | 30 Jun 1921 | United States of America | California | Gulf of California: Angel de… | isotype |
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| Atriplex stewartii I.M.Johnst. | I. M. Johnston 777 | 28 Aug 1940 | Mexico | Coahuila | Eastern border of the Llano… | isotype |
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| Fagonia densa I.M.Johnst. | I. M. Johnston 3532 | 09 May 1921 | Mexico | — | South San Lorenzo Island, Gulf… | isotype |
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| Lupinus elatus I.M.Johnst. | I. M. Johnston 1627 | 30 Jul 1917 | United States of America | California | Head of Icehouse Cañon; San… | isotype |
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| Frankenia gypsophila I.M.Johnst. | I. M. Johnston 7614 | 12 Sep 1938 | Mexico | San Luis Potosí | 6 miles north of San… | isotype |
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| Ephedra viridis Coville | I. M. Johnston 1721 | 23 Aug | United States of America | California | San Antonio Mountains. Prairie Fork… | — |
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| Passiflora arida var. cerralbensis Killip | I. M. Johnston 4043 | 07 Jun 1921 | Mexico | — | [Baja California]: Cerralbo Island, Ruffo's… | isotype |
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| Piper perlasense Trel. | I. M. Johnston 1215 | 22 Jan 1946 | Panama | — | San Jos 130 Island, Perlas… | isotype |
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| Euphorbia polycarpa var. johnstonii L.C.Wheeler | I. M. Johnston 3867 | 24 May 1921 | Mexico | Baja California | Monserrate Island. Ensenada Blanca. | isotype |
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| Sargassum johnstonii Setch. & N.L.Gardner | I. M. Johnston 71 | 27 Apr 1921 | Mexico | Sonora | At Georges Island | isotype |
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| Sargassum herporhizum Setch. & N.L.Gardner | I. M. Johnston 72 | 27 Apr 1921 | Mexico | Sonora | At Georges Island | isotype |
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| Sargassum insulare Setch. & N.L.Gardner | I. M. Johnston s.n. | Jun 1921 | Mexico | Baja California | San Marcos Island | probable type |
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| Cryptantha crassisepala (Torr. & A.Gray) Greene | I. M. Johnston 3309 | 15 Jun 1944 | United States of America | Utah | Grand Co. Desert Valley, northwest… | — |
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| Plagiobothrys mollis (A.Gray) I.M.Johnst. | I. M. Johnston 11978 | 10 Jul 1935 | United States of America | Oregon | Harney Co. Moist field just… | — |
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| Plagiobothrys scouleri var. penicillatus (Greene) Cronquist | I. M. Johnston 2152 | 21 Jun 1940 | United States of America | Idaho | Owyhee Co. Cow Creek, Idaho;… | — |
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| Ebenopsis confinis (Standl.) Barneby & J.W.Grimes | I. M. Johnston 3498 | 8 May 1921 | Mexico | Baja California | Las Animas Bay | — |
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| Psathyrotes ramosissima (Torr.) A.Gray | I. M. Johnston 3340 | 29 Apr 1921 | Mexico | Baja California | San Luis Gonzalez Bay | — |
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| Lysiloma candidum Brandegee | I. M. Johnston 3613 | 12 May 1921 | Mexico | Baja California Sur | San Marcos Island, B. C.… | — |
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| Eragrostis pectinacea var. miserrima (E.Fourn.) Reeder | I. M. Johnston 7786 | 19 Sep 1938 | Mexico | Durango | Road from Bermejillo to Zaragoza… | — |
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| Astragalus lentiginosus var. coachellae Barneby | I. M. Johnston 1065 | 04 Apr 1917 - 06 Apr 1917 | United States of America | California | Whitewater | — |
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| Bursera microphylla A.Gray | I. M. Johnston 4168 | 18 Jun 1921 | Mexico | — | Coyote Bay, Concepcion Bay. | — |
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| Monardella australis subsp. jokerstii Elvin & A.C.Sanders | I. M. Johnston 5118 | 22 Jul 1925 | United States of America | California | San Bernardino Co. Cucamonga Peak,… | paratype |
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| Clidemia octona (Bonpl.) L.O.Williams | I. M. Johnston 1027 | 03 Jan 1946 | Panama | — | San Jose Island, Perlas archipelago,… | — |
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| Errazurizia megacarpa (S.Watson) I.M.Johnst. | I. M. Johnston 3348 | 29 Apr 1921 | Mexico | Baja California | San Luis Gonzales Bay | — |
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