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Published in Rhodora, in 1991, in volume 93, issue 873, pages 51-66

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Published in Annals of the Missouri Botanical Garden, in 1988, in volume 75, pages 1150

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Published in Annals of the Missouri Botanical Garden, in 1989, in volume 76, pages 532-584

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Published in The Wilson Bulletin, in 1991, in volume 103, issue 4, pages 650-655

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Published in Annals of the Missouri Botanical Garden, in 1988, in volume 75, pages 1153-1154

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Published in Pacific Science, in 1960, in volume 14, issue 1, pages 68-74

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Published in Austrobaileya, in 2021, in volume 11, pages 80-86

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