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Cephaelis amoena Bremek.
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Steyermark, J. A. 1995. Flora of the Venezuelan Guayana Project.
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Funk, V. A., P. E. Berry, S. Alexander, T. H. Hollowell & C. L. Kelloff. 2007. Checklist of the plants of the Guiana Shield (Venezuela: Amazonas, Bolivar, Delta Amacuro; Guyana, Surinam, French Guiana). Contr. U.S. Natl. Herb. 55: 1–584.
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Taylor, C. M., J. A. Steyermark, P.G. Delprete, A. Vincentini, R. Cortés, D. C. Zappi, C. H. Persson, C. B. Costa & E. Anunciação. 2004. Rubiaceae. 8: 497–847. In J. A. Steyermark, P. E. Berry & B. K. Holst (eds.) Fl. Venez. Guayana. Missouri Botanical Garden Press, St. Louis.
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Taylor, C. M. 2010-2020. Studies in Tropical Rubiaceae.
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Cephaelis colorata Willd. ex Roem. & Schult.
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Taylor, C. M. 2010-2020. Studies in Tropical Rubiaceae.
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Funk, V. A., P. E. Berry, S. Alexander, T. H. Hollowell & C. L. Kelloff. 2007. Checklist of the plants of the Guiana Shield (Venezuela: Amazonas, Bolivar, Delta Amacuro; Guyana, Surinam, French Guiana). Contr. U.S. Natl. Herb. 55: 1–584.
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Steyermark, J. A. 1995. Flora of the Venezuelan Guayana Project.
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Psychotria calviflora Steyerm.
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Funk, V. A., P. E. Berry, S. Alexander, T. H. Hollowell & C. L. Kelloff. 2007. Checklist of the plants of the Guiana Shield (Venezuela: Amazonas, Bolivar, Delta Amacuro; Guyana, Surinam, French Guiana). Contr. U.S. Natl. Herb. 55: 1–584.
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Taylor, C. M., J. A. Steyermark, P.G. Delprete, A. Vincentini, R. Cortés, D. C. Zappi, C. H. Persson, C. B. Costa & E. Anunciação. 2004. Rubiaceae. 8: 497–847. In J. A. Steyermark, P. E. Berry & B. K. Holst (eds.) Fl. Venez. Guayana. Missouri Botanical Garden Press, St. Louis.
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