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Published in Madroño, in 1981, in volume 28, issue 2, pages 86-90

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Published in Sida, Contributions To Botany, in 1999, in volume 18, issue 4, pages 987-999

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Published in Phytologia, in 1988, in volume 64, issue 3, pages 179-184

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Published in Rhodora, in 1976, in volume 78, issue 816, pages 776-782

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Published in Rhodora, in 1913, in volume 15, pages 45-58

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Published in Botanical Gazette, in 1909, in volume 47, issue 3, pages 250

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