Displaying 1 - 50 out of 298 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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| Disciseda uplandii (Lloyd) Zeller | I. M. Johnston 5552 | 21 May 1922 | United States of America | California | Hemet Valley, San Jacinto Mts. | — | ||||
| Cercidium molle I.M.Johnst. | I. M. Johnston 3877 | 26 May 1921 | Mexico | — | Agua Verde Bay, Baja California. | isotype |
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| Bovista aestivalis (Bonord.) Demoulin | I. M. Johnston 1335 | Mar 1919 | United States of America | California | Alameda Co. | — | ||||
| 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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| Neomammillaria evermanniana Britton & Rose | I. M. Johnston 4058 | 1921 | Mexico | Baja California | Ceralbo Island | photo of type | ||||
| 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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| Boletus rubellus Krombh. | I. M. Johnston 38 | 29 Dec 1918 | United States of America | California | Live Oak Canon, San Antonio… | — | ||||
| Boletus rubellus Krombh. | I. M. Johnston 39 | 29 Dec 1918 | United States of America | California | Live Oak Canon, San Antonio… | — | ||||
| Boletus rubellus Krombh. | I. M. Johnston 28 | 21 Dec 1918 | United States of America | California | Live Oak Canon, San Antonio… | — | ||||
| Boletus rubellus Krombh. | I. M. Johnston 43 | 30 Dec 1918 | United States of America | California | Los Angeles Co. Mouth of… | — | ||||
| Boletus rubellus Krombh. | I. M. Johnston 36 | 30 Dec 1918 | United States of America | California | Los Angeles Co. | — | ||||
| 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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| Boletus flaviporus Earle | I. M. Johnston 37 | 22 Dec 1918 | United States of America | California | Los Angeles Co. San Antonio… | — | ||||
| Boletus flaviporus Earle | I. M. Johnston 6 | 01 Dec 1918 | United States of America | California | Los Angeles Co. San Antonio… | — | ||||
| Boletus flaviporus Earle | I. M. Johnston 40 | 29 Dec 1918 | United States of America | California | Live Oak Cañon, San Antonio… | — | ||||
| 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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| Russula paxilloides Earle | I. M. Johnston 9 | 01 Dec 1918 | United States of America | California | Los Angeles Co. Evey Cañon,… | — | ||||
| 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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| Suillus granulatus (L.:Fr.) Kuntze | I. M. Johnston 20 | 08 Dec 1918 | United States of America | California | San Bernardino Co. | — | ||||
| 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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