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Published in Phytologia, in 1974, in volume 27, issue 6, pages 440

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Published in Journal of The Arnold Arboretum, in 1973, in volume 54, issue 2, pages 309-314

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Published in Contributions From The University of Michigan Herbarium, in 1972, in volume 9, issue 4, pages 359-484

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Published in Contributions from the University of Michigan Herbarium, in 1978, in volume 11, issue 5, pages 277-280

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Published in Contributions from the University of Michigan Herbarium, in 1975, in volume 11, issue 2, pages 65-68

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