Accepted By:
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Abrams, L.R. & R. S. Ferris. 1960. Bignonias to Sunflowers. 4: 732 pp. In L.R. Abrams (ed.) Ill. Fl. Pacific States. Stanford University Press, Stanford.
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AFPD. 2008. African Flowering Plants Database - Base de Donnees des Plantes a Fleurs D'Afrique.
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De la Torre, H. Navarrete, P. Muriel, M. J. Macía & H. Balslev. 2008. Enciclopedia Pl. Utiles Ecuador
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Flora of North America Editorial Committee, e. 2006. Magnoliophyta: Asteridae, part 6: Asteraceae, part 1. 19: i–xxiv, 1–579. In Fl. N. Amer.. Oxford University Press, New York.
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Hickman, J. C. 1993. The Jepson Manual: Higher Plants of California 1–1400. University of California Press, Berkeley.
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Jeffrey, C. 1966. Notes on Compositae: I. The Cichorieae in East Tropical Africa. Kew Bull. 18(3): 427–486.
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Munz, P. A. & D. D. Keck. 1959. Cal. Fl. 1–1681. University of California Press, Berkeley.
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