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Published in Journal of The Botanical Research Institute of Texas, in 2010, in volume 4, issue 2, pages 581-585
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Published in Phytologia, in 1997, in volume 82, issue 4, pages 269-272
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Published in Madroño, in 1991, in volume 38, issue 3, pages 206-207
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Ajo Peak to Tinajas Altas: A flora of southwestern Arizona: Part 3: Ferns, lycopods, and gymnosperms
Published in Phytoneuron, in 2013, in volume 2013-37, pages 1-46
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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 Transactions of the San Diego Society of Natural History, in 1985, in volume 21, pages 23-55
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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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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 Torreya, in 1936, in volume 36, issue 2, pages 37-40
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Published in Phytoneuron, in 2013, in volume 2013-48, pages 1-6
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Published in Journal of South African botany, in 1968, in volume 34, pages 257-263
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Published in Transactions of The San Diego Society of Natural History, in 1982, in volume 20, pages 1-26
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Published in Torreya, in 1939, in volume 39, issue 1, pages 10-12
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Published in Transactions of The San Diego Society of Natural History, in 1984, in volume 20, pages 247-276
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Published in Torreya, in 1903, in volume 3, issue 12, pages 177-179
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Published in Nautilus Boston Mass, in 1919, in volume 33, pages 72
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Published in Bothalia, in 2012, in volume 42, issue 2, pages 187-190
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Published in Bothalia, in 2007, in volume 37, issue 1, pages 55-56
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Published in Bothalia, in 2003, in volume 33, issue 2, pages 158-159
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Published in Journal of South African botany, in 1957, in volume 23, pages 139-149
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Published in Journal of South African Botany, in 1976, in volume 42, issue 2, pages 109-119
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Published in Rhodora, in 1914, in volume 16, issue 190, pages 183-184
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Published in Rhodora, in 1919, in volume 21, issue 241, pages 24
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Published in Bothalia, in 2011, in volume 41, issue 1, pages 185-186
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Published in Phytoneuron, in 2015, in volume 2015-8, pages 1-6
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Published in Journal of South African Botany, in 1977, in volume 43, issue 1, pages 81-91
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Published in Journal of The Botanical Research Institute of Texas, in 2012, in volume 6, issue 1, pages 157-257
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Published in Annals of The Transvaal Museum, in 1911, in volume 3, issue 2, pages 102-108
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Published in Annals of The Transvaal Museum, in 1913, in volume 4, issue 1, pages 1-46
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in 1923, pages 1-314
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