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Published in Phytologia, in 1986, in volume 61, issue 3, pages 204-206
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Published in The Wilson Bulletin, in 1963, in volume 75, issue 3, pages 295-325
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Published in Biol Bull, in 1975, in volume 149, pages 331-347
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Published in Rhodora, in 1959, in volume 61, issue 732, pages 307-309
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