Joseph Nelson Rose: Studies of Mexican and Central American Plants – No. 3. In: Contributions from the United States National Herbarium. Band 8, Teil 1, 1903, S. 20 (online).
Lloyd Herbert Shinners: Texas Polianthes, including Manfreda (Agave subgenus Manfreda) and Runyonia (Agavaceae). In: Sida. Band 2, Nummer 4, 1966, S. 337 (online).
Joseph Nelson Rose: Studies of Mexican and Central American Plants – No. 3. In: Contributions from the United States National Herbarium. Band 8, Teil 1, 1903, S. 21 (online).
Lloyd Herbert Shinners: Texas Polianthes, including Manfreda (Agave subgenus Manfreda) and Runyonia (Agavaceae). In: Sida. Band 2, Nummer 4, 1966, S. 337 (online).