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Published in Journal of The Arnold Arboretum, in 1948, in volume 29, issue 4, pages 321-392

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Published in Phytologia, in 1986, in volume 60, issue 2, pages 153-154

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Published in Phytologia, in 1987, in volume 62, pages 267-275

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Published in Madroño, in 1956, in volume 13, issue 8, pages 244-252

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Published in Phytologia, in 1992, in volume 72, issue 2, pages 77-78

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Published in Phytologia, in 1996, in volume 80, issue 4, pages 295

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Published in Madroño, in 1998, in volume 45, issue 4, pages 331

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Published in Madroño, in 1999, in volume 46, issue 4, pages 224

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