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Published in Nautilis, in 1916, in volume 29, pages 109-110

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Published in Annals of the Missouri Botanical Garden, in 1931, in volume 18, pages 509-540

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Published in Proceedings of The Royal Society of Victoria, in 1939, in volume 52, issue 1, pages 164-175

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Published in Veliger, in 1989, in volume 32, pages 296-301

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Published in Acta Botánica Mexicana, in 2012, in volume 99, pages 55-72

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