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Published in Annals And Magazine of Natural History, in 1877, in volume 20, pages 38-42
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Published in Annals And Magazine of Natural History, in 1861, in volume 8, pages 281-290
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Published in Madroño, in 1974, in volume 22, issue 6, pages 303-311
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Published in Botanical Museum Leaflets, Harvard University, in 1977, in volume 25, pages 289-320
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Published in Proceedings of The Biological Society of Washington, in 1962, in volume 75, pages 193-197
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Published in Proceedings of The Biological Society of Washington, in 1961, in volume 74, pages 161-165
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Published in The Great Basin Naturalist, in 1983, in volume 43, pages 88-92
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