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Published in Annals of the Missouri Botanical Garden, in 1992, in volume 79, pages 648-675

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Published in The Auk, in 1917, in volume 34, pages 243-264

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Published in Journal of South African botany, in 1949, in volume 15, pages 43-48

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Published in Ibis, in 1880, in volume 4, issue 4, pages 460-461

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Published in Rhodora, in 1901, in volume 3, pages 83-84

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Published in Torreya, in 1915, in volume 15, issue 11, pages 246-247

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Published in Nuytsia, in 2016, in volume 27, pages 21-30

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Published in Breviora, in 1960, in volume 127, pages 1-14

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Published in Rhodora, in 1944, in volume 46, issue 550, pages 377-386

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Published in Madroño, in 1939, in volume 5, issue 4, pages 135-136

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Published in Madroño, in 1993, in volume 40, issue 1, pages 66-67

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Published in Rhodora, in 1995, in volume 97, issue 889, pages 39-93

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