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Echtrus Lour.
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Martínez Ojeda, E. 1982. Papaveraceae. Fl. Veracruz 22: 1–16.
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Ownbey, G. B. 1958. Monograph of the genus Argemone for North America and the West Indies. Mem. Torrey Bot. Club 21(1): 1–159.
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Ulloa Ulloa, C., H. M. Hernández, F. R. Barrie & S. Knapp. 2024. Cycadaceae a Cactaceae. 2(1): ined. In C. Ulloa Ulloa, H. M. Hernández Macías, F. R. Barrie & S. Knapp Fl. Mesoamer.. Missouri Botanical Garden, St. Louis.
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Enomegra A. Nelson
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Martínez Ojeda, E. 1982. Papaveraceae. Fl. Veracruz 22: 1–16.
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Ownbey, G. B. 1958. Monograph of the genus Argemone for North America and the West Indies. Mem. Torrey Bot. Club 21(1): 1–159.
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