For Cynoglossum
Al-Shehbaz, I.A. 1991. The genera of Boraginaceae in the southeastern United States. J. Arnold Arb. Suppl. Series 1: 1-169.
Hilger, H.H., W. Greuter, and V. Stier. 2015. Taxa and names in Cynoglossum sensu lato (Boraginaceae, Cynoglosseae): an annotated, synonymic inventory, with links to the protologues and mention of original material. Biodioversity Data J. 3: e4831.
Selvi, F., and K. Sutorý. 2012. A synopsis of the genus Cynoglossum (Boraginaceae-Cynoglosseae) in Italy. Pl. Biosystems 146: 461-479.
Weigend, M., F. Luebert, F. Selvi, G. Brokamp, and H.H. Hilger. 2013. Multiple origins for Hound’s tongues (Cynoglossum L.) and Navel seeds (Omphalodes Mill.) – the phylogeny of the borage family (Boraginaceae s.str.). Molecular Phylogenetics and Evolution 68: 604-618.
Weigend, M., F. Selvi, D.C. Thomas, and H.H. Hilger. 2016. Boraginaceae. In Kadereit, J.W., and V. Bittrich. 2016. The families and genera of flowering plants. XIV. Flowering plants – Eudicots – Aquifoliales, Boraginales, Bruniales, Dipsacales, Escalloniales, Garryales, Paracryphiales, Solanales (except Convolvulaceae), Icacinaceae, Metteniusaceae, Vahliaceae. Springer, Berlin. 412 pp.
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