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Flora Batava, deel 14, Jan Kops en F.W. van Eeden (1872)
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La Belgique horticole, journal des jardins et des vergers, deel 25 (1875)
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Gartenflora, deel 20, E. von Regel (1871)
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A guide to wild flowers, A. Lounsberry, E. Rowan (1899)
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Curtis's Botanical Magazine, deel 52, J. Curtis (1825)
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Hortus Kewensis, deel 2, W. Aiton, G.D. Ehret (1789)
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Revue horticole, serie 4, deel 57, L. Descamps-Sabouret (1885)
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The native flowers and ferns of the United States in their botanical, horticultural, and popular aspects, deel 2, T. Meehan (1878-1879)
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