Displaying 1 - 25 out of 323 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Acalypha californica Benth. | H. L. Mason 2021 | 06 Jun 1925 | Mexico | — | Cedros Island | — |
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| Acalypha umbrosa Brandegee | H. L. Mason 1623 | 04 May 1925 | Mexico | — | Socorro Island. Grayson's Cove | — |
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| Acer circinatum Pursh | H. L. Mason s.n. | 16 Jul 1926 | United States of America | Oregon | Hood River Co. | — |
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| Achnatherum occidentale (Thurb. ex S.Watson) Barkworth | H. L. Mason 12357 | 01 Aug 1940 | United States of America | Nevada | Washoe Co. Road to Mount… | — |
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| Achnatherum occidentale (Thurb. ex S.Watson) Barkworth | H. L. Mason 12357 | 01 Aug 1940 | United States of America | Nevada | Washoe Co. Road to Mount… | — |
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| Aesculus californica (Spach) Nutt. | H. L. Mason 2129 | 27 Jun 1925 | United States of America | California | Tuolumne Co. Tuolumne canyon near… | — |
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| Agave | H. L. Mason 1892 | 29 May 1925 | Mexico | — | Revillagigedo Island. Magdalena Bay, Lower… | — |
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| Alisma geyeri Torr. | H. L. Mason 14647 | 13 Aug 1955 | United States of America | California | Lassen Co. Willow Creek Valley. | — |
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| Allium fimbriatum S.Watson var. fimbriatum | H. L. Mason 3022 | 26 Apr 1926 | United States of America | California | Los Angeles Co. Near Rock… | — |
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| Allium hyalinum Curran | H. L. Mason 6948 | 17 Apr 1932 | United States of America | California | Santa Clara Co. Margins of… | — |
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| Alnus incana subsp. tenuifolia (Nutt.) Breitung | H. L. Mason 12172 | 18 Jul 1939 | United States of America | California | El Dorado Co. Along stream… | — |
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| Alnus incana subsp. tenuifolia (Nutt.) Breitung | H. L. Mason 12172 | 18 Jul 1939 | United States of America | California | El Dorado Co. Along stream… | — |
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| Alopecurus geniculatus L. | H. L. Mason 764 | 29 May 1949 | United States of America | California | Modoc Co. 2 miles east… | — |
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| Amaranthus blitoides S.Watson | H. L. Mason 13326 | 10 Jul 1947 | United States of America | California | Modoc Co. Dorris Reservoir, 2… | — |
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| Amsinckia tessellata A.Gray | H. L. Mason 4750 | 24 May 1928 | United States of America | Nevada | Elko Co. Rocky hills about… | — |
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| Anthoxanthum monticola (Bigelow) Veldkamp | H. L. Mason s.n. | 18 Aug 1931 | United States of America | Alaska | Wainwright Inlet, Arctic Coast | — |
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| Apocynum cannabinum L. | H. L. Mason 13244 | 26 Jun 1947 | United States of America | California | Solano Co. Cordelia Slough, Suisun… | — |
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| Aquilegia formosa Fisch. ex DC. | H. L. Mason 4782 | 25 May 1928 | United States of America | Nevada | Elko Co. Cliffs, one mile… | — |
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| Arabis lemmonii var. depauperata (A.Nelson & P.B.Kenn.) Rollins | H. L. Mason 11326 | 24 Jul 1936 | United States of America | California | Tuolumne Co. White Mountain, Mount… | — |
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| Arctostaphylos lacinosa | H. L. Mason 11770 | 07 May 1938 | United States of America | California | Santa Barbara Co. Burton Mesa,… | — |
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| Arctostaphylos pechoensis var. viridissima Eastw. | H. L. Mason 8055 | 31 Mar 1934 | United States of America | California | Santa Barbara Co. La Purrissima… | — |
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| Arctostaphylos tomentosa (Pursh) Lindl. | H. L. Mason 11804 | 08 May 1938 | United States of America | California | Santa Barbara Co. Vicinity of… | — |
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| Arctostaphylos uva-ursi (L.) Spreng. | H. L. Mason 3881 | 11 Jul 1927 | United States of America | Washington | Whatcom Co. On hills about… | — |
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| Asclepias subulata Decne. | H. L. Mason 1973 | 02 Jun 1925 | Mexico | — | Turtle Bay. North of bay | — |
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| Asclepias subulata Decne. | H. L. Mason 1863 | 1925 | Mexico | — | Cape San Lucas | — |
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