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Published in Botanical Museum Leaflets, Harvard University, in 1956, in volume 17, pages 217-239
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Published in Rhodora, in 1920, in volume 22, issue 264, pages 194-195
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Published in Botanical Museum Leaflets, Harvard University, in 1961, in volume 19, pages 163-181
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Published in Bulletin of The African Bird Club, in 2007, in volume 14, issue 1, pages 68-69
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