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Published in Annals of the Missouri Botanical Garden, in 1978, in volume 65, pages 1058-1087

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Published in Proceedings of the United States National Museum, in 1968, in volume 124, pages 1-61

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Published in Rhodora, in 1982, in volume 84, issue 837, pages 156

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Published in Rhodora, in 1948, in volume 50, issue 591, pages 60-62

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