For Linaria
Fernández-Mazuecos, M., J.L. Blanco-Pastor, & P. Vargas. 2013. A phylogeny of toadflaxes (Linaria Mill.) based on nuclear internal transcribed spacer sequences: systematic and evolutionary consequences. Int. J. Plant Sci. 174: 234-249.
Freeman, C.C. 2019j. Nuttallanthus. 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.
Ogutcen, E., and J.C. Vamosi. 2016. A phylogenetic study of the tribe Antirrhineae: Genome duplications and long-distance dispersals from the Old World to the New World. Amer. J. Bot. 103: 1071-1081.
Pennell, F.W. 1935. The Scrophulariaceae of eastern temperate North America. Academy of Natural Sciences of Philadelphia Monograph No. 1.
Sáez Goñalons, L. 2019. Linaria. 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.
Sutton, D.A. 1988. A revision of the tribe Antirrhineae. British Museum (Natural History), Oxford Univ. Press, London.
Yousefi, N., G. Heubl, and S. Zarre. 2017. Subgeneric classification of Linaria (Plantaginaceae; Antirrhineae): molecular phylogeny and morphology revisited. Progr. In Biol. Sci. 7: 53-65.
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