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Published in Annals of the Missouri Botanical Garden, in 1991, in volume 78, pages 105-130

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Published in Biol Bull, in 1971, in volume 140, pages 201-214

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Published in Phytologia, in 1966, in volume 14, pages 65-98

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Published in Bulletin of The British Ornithologists' Club, in 2002, in volume 122, issue 3, pages 180-185

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Published in Breviora, in 1963, in volume 193, pages 1-13

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