Displaying 1 - 25 out of 323 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Astragalus alpinus L. var. alpinus | H. L. Mason s.n. | 02 Aug 1931 | United States of America | Alaska | Point Lay, Artic Coast | — | 01215240 |
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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 | — | 1640972 |
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| Salix ovalifolia Trautv. | H. L. Mason 6426 | 02 Aug 1931 | United States of America | Alaska | Point Lay, Arctic Coast. | — | 2062023 |
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| Salix ovalifolia Trautv. | H. L. Mason 6059 | 08 Jun 1931 | United States of America | Alaska | Whale Island, Norton Sound. | — | 2062024 |
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| Salix ovalifolia var. cyclophylla (Rydb.) C.R.Ball | H. L. Mason 6101 | 10 Jul 1931 | United States of America | Alaska | St. Lawrence Island, Bering Sea.… | — | 2062047 |
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| Salix ovalifolia var. subartica | H. L. Mason 6102 | 10 Jul 1931 | United States of America | Alaska | St. Lawrence Island, Bering sea,… | — | 02062048 |
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| Salix polaris Wahlenb. | H. L. Mason 6014 | 24 May 1931 | United States of America | Alaska | Dolgoi Island, Aleutian Chain. | — | 2060745 |
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| Salix reticulata var. subrotunda L. & Ser. | H. L. Mason 6109 | 10 Jul 1931 | United States of America | Alaska | St. Lawrence Island, Bering Sea.… | — | 02424747 |
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| Salix reticulata var. subrotunda L. & Ser. | H. L. Mason 6110 | 10 Jul 1931 | United States of America | Alaska | St. Lawrence Island, Bering Sea.… | — | 2424748 |
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| Salix reticulata var. subrotunda L. & Ser. | H. L. Mason 6084 | 26 Jun 1931 | United States of America | Alaska | Sevoonga, St. Lawrence Island, Bering… | — | 2424749 |
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| Salix rotundifolia Rydb. | H. L. Mason 6459 | 18 Aug 1931 | United States of America | Alaska | Wainwright Inlet, Arctic Coast | — | 2424828 |
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| Myosotis alpestris F.W.Schmidt | H. L. Mason s.n. | 13 Aug 1931 | United States of America | Alaska | Cape Lisburne. | — | 2432145 |
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| Betula glandulosa Michx. | H. L. Mason 6105 | 24 May 1931 | United States of America | Alaska | Dolgoi Island, Aleutian Chain. | — | 2475938 |
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| Spinulum subarcticum (V.N.Vassil.) A.Haines | H. L. Mason 6010 | 24 May 1931 | United States of America | Alaska | Dolgoi Island, Aleutian Chain. | — | 3330367 |
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| Huperzia miyoshiana (Makino) Ching | H. L. Mason 6009 | 24 May 1931 | United States of America | Alaska | Dolgoi Island, Aleutian Chain. | — | 3888234 |
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| Spinulum subarcticum (V.N.Vassil.) A.Haines | H. L. Mason 6020 | 30 May 1931 | United States of America | Alaska | Aleutian Islands: Unalaska. | — | 3330380 |
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| Diphasiastrum alpinum (L.) Holub | H. L. Mason 6018 | 30 May 1931 | United States of America | Alaska | Unalaska. | — | 3148110 |
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| Tricholoma ionides (Bull.) Fr. | H. L. Mason 239b | 1931 | United States of America | Alaska | 25 miles south of Point… | — | 518199 | ||
| Codium cylindricum Holmes | H. L. Mason s.n. | Apr 1925 - May 1925 | United States of America | Alaska | Ketchikan Gateway Borough. Alexander Archipelago,… | — | 03205956 |
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| Dactylorhiza aristata (Fisch. ex Lindl.) Soó | H. L. Mason 6033 | 30 May 1931 | United States of America | Alaska | Aleutians West Census Area. Unalaska,… | — | 4054896 |
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| Penstemon cedrosensis Kellogg | H. L. Mason 2021 | 1925 | Mexico | Baja California | Cedros Island. North end of… | — | 772967 |
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| Pinus muricata var. cedrosensis J.T.Howell | H. L. Mason 2030 | 03 Jun 1925 | Mexico | Baja California | Cedros Island. | isotype | 5382 |
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| Astragalus magdalenae Greene var. magdalenae | H. L. Mason 1954 | 30 May 1925 | Mexico | Baja California | Magdalena Bay | — | 01268057 | ||
| Marina divaricata (Benth.) Barneby | H. L. Mason 1888 | 29 May 1925 | Mexico | Baja California | Magdalena Bay | — | 01307015 | ||
| Sphaeralcea fulva Greene | H. L. Mason 2013 | 04 Jun 1925 | Mexico | Baja California | Cedros Island | — | 3972507 |
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