Displaying 1 - 25 out of 323 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Salix phylicifolia var. monica (Bebb) Jeps. | H. L. Mason 337 | 31 Jul 1922 | United States of America | California | Tuolumne Co. Lyell Fork of… | — |
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| Chorizanthe pungens Benth. | H. L. Mason 565 | 23 Jun 1923 | United States of America | California | Monterey Co. Del Monte | — |
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| Phragmidium ivesiae Syd. | H. L. Mason 616 | 20 Jul 1923 | United States of America | California | Tuolumne Co. Edge of meadow,… | — |
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| Phragmidium ivesiae Syd. | H. L. Mason 616 | 20 Jul 1923 | United States of America | California | Tuolumne Co. Edge of meadow,… | — |
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| Potentilla glandulosa var. glandulosa | H. L. Mason 1006 | 13 May 1924 | United States of America | California | Alameda Co. Berkeley Hills. | — |
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| Ulva | H. L. Mason 256 | Apr 1925 - May 1925 | Mexico | Colima | Revillagigedo Islands | — |
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| Laurencia masonii Setch. & N.L.Gardner | H. L. Mason 8 | Apr 1925 | Guadeloupe | — | South Anchorage | isotype |
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| Codium cylindricum Holmes | H. L. Mason s.n. | Apr 1925 - May 1925 | United States of America | Alaska | Ketchikan Gateway Borough. Alexander Archipelago,… | — |
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| Codium cylindricum Holmes | H. L. Mason 14 | Apr 1925 - May 1925 | Mexico | Colima | Clarion island, Revillagigedo islands | — |
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| Codium cylindricum Holmes | H. L. Mason | Apr 1925 - May 1925 | Mexico | Colima | Clarion island, Revillagigedo islands | — |
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| Euphorbia misera Benth. | H. L. Mason 1496 | 18 Apr 1925 | United States of America | California | San Diego Co. Hills near… | — |
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| Sapindus saponaria L. | H. L. Mason 1561 | 26 Apr 1925 | — | — | Clarion Island, near beach on… | — |
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| Nicotiana nesophila I.M.Johnst. | H. L. Mason 1596 | 03 May 1925 | Mexico | — | Revillagigedo Islands; Socorro Island; Beumers… | isotype |
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| Euphorbia anthonyi Brandegee | H. L. Mason 1600 | 3 May 1925 | Mexico | Colima | Manzanillo Mun. Revillagigedo Islands, Socorro… | — |
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| Hypericum eastwoodianum I.M.Johnst. | H. L. Mason 1614 | 04 May 1925 | Mexico | Colima | Grayson's Cove, Socorro Island, Revillagigedo… | type |
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| Sida nesogena I.M.Johnst. | H. L. Mason 1613 | 04 May 1925 | Mexico | — | Revillagigedo Islands: Isla Socorro, Garson's… | type fragment |
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| Sida nesogena I.M.Johnst. | H. L. Mason 1613 | 04 May 1925 | Mexico | Colima | Revilla Gigedo Islands; Socorro Island;… | isotype |
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| Acalypha umbrosa Brandegee | H. L. Mason 1623 | 04 May 1925 | Mexico | — | Socorro Island. Grayson's Cove | — |
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| Erigeron crenatus Eastw. | H. L. Mason 1683 | 11 May 1925 | Mexico | — | San Benedicto Island (Revillagigedo Islands) | type |
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| Tillandsia paucifolia Baker | H. L. Mason 1765 | 18 May 1925 | Mexico | — | Maria Madre. Arroyo Honda | — |
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| Tillandsia juncea (Ruiz & Pav.) Poir. | H. L. Mason 1723 | 19 May 1925 | Mexico | — | Revillagigedo Islands. Tres Marias Islands.… | — |
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| Coccoloba masonii Lundell | H. L. Mason 1806 | 21 May 1925 | Mexico | Colima | Revillagigedo Islands; Tres Marias Islands;… | type |
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| Marina divaricata (Benth.) Barneby | H. L. Mason 1888 | 29 May 1925 | Mexico | Baja California | Magdalena Bay | — | ||||
| Agave | H. L. Mason 1892 | 29 May 1925 | Mexico | — | Revillagigedo Island. Magdalena Bay, Lower… | — |
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| Dudleya albiflora Rose | H. L. Mason 1898 | 29 May 1925 | Mexico | — | Revillagigedo Island | — |
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