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Published in Asa Gray correspondence. Senders A, in 1876, pages 1-2
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Published in Asa Gray correspondence. Senders A, in 1881, pages 1-2
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Published in Asa Gray correspondence. Senders A, in 1878, pages 1-2
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Ajo Peak to Tinajas Altas: A flora of southwestern Arizona: Part 3: Ferns, lycopods, and gymnosperms
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Published in Asa Gray correspondence. Senders A, in 1878, pages 1-2
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Published in Asa Gray correspondence. Senders A, in 1876, pages 1-2
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Published in Asa Gray correspondence. Senders A, in 1876, pages 1-2
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Published in Asa Gray correspondence. Senders A, in 1875, pages 1-2
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Published in Sida, Contributions To Botany, in 2002, in volume 20, issue 1, pages 339-347
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Published in Madroño, in 1934, in volume 2, issue 17, pages 157
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Published in Transactions of the San Diego Society of Natural History, in 1985, in volume 21, pages 23-55
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Published in Journal of The Botanical Research Institute of Texas, in 2012, in volume 6, issue 2, pages 529-550
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Published in Sida, Contributions To Botany, in 2005, in volume 21, issue 3, pages 1905-1908
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Published in Journal of The Botanical Research Institute of Texas, in 2011, in volume 5, issue 1, pages 67-74
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