Displaying 1 - 25 out of 253 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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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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| Achnatherum occidentale (Thurb. ex S.Watson) Barkworth | I. M. Johnston 1504 | 2000 | United States of America | California | Kelly's Cabin (Ontario Pk). Canadian… | — |
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| Acrosorium uncinatum (W.B.Turner) Kylin | I. M. Johnston 65 | 07 Apr 1921 | Mexico | Baja California | Ensenada Bay, Baja California | — |
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| Adelia brandegeei V.W.Steinm. | I. M. Johnston 4310 | 7 Jul 1921 | Mexico | Sonora | San Pedro Bay | — |
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| Agaricus campestris L.:Fr. | I. M. Johnston 1 | 01 Dec 1918 | United States of America | California | Evey Canyon, San Antonio Mts,… | — |
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| Agrostis exarata Trin. | I. M. Johnston 1510 | 28 Jul 1917 | United States of America | California | San Antonio Mountains. | — |
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| Agrostis idahoensis Nash | I. M. Johnston 1522 | 30 Jul 1917 | United States of America | California | Kelly's cabin, Ontario Peak. Upper… | — |
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| Amauria rotundifolia Benth. | I. M. Johnston 3676 | 13 May 1921 | Mexico | Baja California Sur | Mulege. Mulege | — |
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| Ambrosia ilicifolia (A.Gray) W.W.Payne | I. M. Johnston 3204 | 20 Apr 1921 | Mexico | Sonora | San Esteban Island | — |
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| Arctostaphylos tomentosa (Pursh) Lindl. | I. M. Johnston s.n. | 13 Aug 1924 | United States of America | California | Sunset Trail, 1.5 mi S… | — |
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| Argythamnia brandeeei var. bandegeei Millsp. | I. M. Johnston 3402 | 2 May 1921 | Mexico | Baja California | The Lagoon, Isla Ángel de… | — |
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| Argythamnia lanceolata (Benth.) Müll.Arg. | I. M. Johnston 3726 | 16 May 1921 | Mexico | Baja California Sur | San Nicholas Bay | — |
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| Argythamnia lanceolata (Benth.) Müll.Arg. | I. M. Johnston 4209 | 30 Jun 1921 | Mexico | Baja California | Mexicali Mun. Angel de la… | — |
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| Argythamnia serrata (Torr.) Müll.Arg. | I. M. Johnston 3180 | 29 Apr 1921 | Mexico | Sonora | Hermosillo Mun. San Estaban Island | — |
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| Armillaria putrida (Scop.) Murrill | I. M. Johnston 33 | 22 Dec 1918 | United States of America | California | Los Angeles Co. Claremont | — |
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| Astraeus hygrometricus (Pers.) Morgan | I. M. Johnston s.n. | 07 Dec 1925 | Chile | Antofagasta | El Rincon, just north of… | — |
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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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| Atriplex reptans I.M.Johnst. | I. M. Johnston 1081 | 09 Sep 1940 | Mexico | Coahuila | Along road from San Vicente… | holotype |
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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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| Bajacalia crassifolia (S.Watson) Loockerman, B.L.Turner & R.K.Jansen | I. M. Johnston 3815 | 21 May 1921 | Mexico | Baja California Sur | Loreto Mun. Carmen Island, Puerto… | — |
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| Bebbia atriplicifolia (A.Gray) Greene | I. M. Johnston 4026 | 6 Jun 1921 | Mexico | Baja California Sur | Ceraldo Island | — |
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| Bebbia juncea var. aspera Greene | I. M. Johnston 3236 | 22 Apr 1921 | Mexico | Baja California Sur | La Paz Mun. Isla Partida | — |
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| Bebbia juncea var. aspera Greene | I. M. Johnston 3267 | 28 Apr 1921 | Mexico | Sonora | Hermosillo Mun. Tiburón Island | — |
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| Bouteloua chasei Swallen | I. M. Johnston 7592 | Sept. 11-12, 1938 | Mexico | San Luis Potosí | Road from Matehuala north to… | — |
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