For Plantago
Bassett, I.J. 1966. Taxonomy of North American Plantago L., section Micropsyllium Decne. Can J. Bot. 44: 467-479.
Bassett, I.J. 1967. Taxonomy of Plantago L. in North America: sections Holopsyllium Pilger, Palaeopsyllium Pilger, and Lamprosantha Decne. Can. J. Bot. 45: 565-577.
Hassemer, G., S. Bruun-Lunda, A.B. Shipunov, B.G. Briggs, H.M. Meudt, and N. Rønsted. 2019. The application of high-throughput sequencing for taxonomy: The case of Plantago subg. Plantago (Plantaginaceae). Molec. Phylogen. Evol. 138: 156-173.
Rosatti, T.J. 1984. The Plantaginaceae in the southeastern United States. J. Arnold Arb. 65: 533-562.
Schwarzbach. 2004. In Kadereit, J.W. 2004. The families and genera of vascular plants. VII. Flowering plants – Dicotyledons – Lamiales (except Acanthaceae including Avicenniaceae). Springer, Berlin. 478 pp.
Shipunov, A. 2019b. Plantago. In Flora of North America Editorial Committee. 2019. Flora of North America north of Mexico. Volume 17, Magnoliophyta: Tetrachondraceae to Orobanchaceae. Oxford Univ. Press, New York, NY. 737 pp.
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