Published in Annals of the Missouri Botanical Garden, in 1996, in volume 83, pages 562-573

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Published in Bulletin of The British Ornithologists' Club, in 2003, in volume 123, issue 1, pages 62-64

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Published in Annals of the Missouri Botanical Garden, in 2013, in volume 99, issue 2, pages 167-171

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Published in Phytologia, in 1996, in volume 81, issue 5, pages 382

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Published in Annals of the Missouri Botanical Garden, in 1997, in volume 84, pages 167-200

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Published in Annals of the Missouri Botanical Garden, in 1990, in volume 77, pages 412-417

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Published in Annals of the Missouri Botanical Garden, in 1990, in volume 77, pages 205-206

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Published in The Wilson Bulletin, in 1992, in volume 104, issue 1, pages 55-64

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Published in Annals of the Missouri Botanical Garden, in 1998, in volume 85, pages 273-351

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Published in Sida, Contributions To Botany, in 2005, in volume 21, issue 3, pages 1675-1694

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Published in Sida, Contributions To Botany, in 2003, in volume 20, issue 4, pages 1651-1661

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Published in Malacologia, in 2013, in volume 56, issue 1, pages 121-134

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