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Published in The Victorian naturalist, in 1970, in volume 87, pages 88-93

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Published in Biol Bull, in 1953, in volume 104, pages 182-196

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Published in Annals of the Missouri Botanical Garden, in 1979, in volume 66, pages 633-700

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Published in Annals of the Missouri Botanical Garden, in 1992, in volume 79, pages 65-80

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Published in Texas Journal of Science, in 1998, in volume 50, issue 3, pages 195-198

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