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Published in Annals of the Missouri Botanical Garden, in 1973, in volume 60, pages 567

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Published in The Wilson Bulletin, in 1941, in volume 53, issue 1, pages 31-32

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Published in Western Australian Naturalist, in 1979, in volume 14, issue 6, pages 165-168

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Published in The Wilson Bulletin, in 1956, in volume 68, issue 4, pages 320

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