For Boraginaceae
Al-Shehbaz, I.A. 1991. The genera of Boraginaceae in the southeastern United States. J. Arnold Arb. Suppl. Series 1: 1-169.
Constance, L. 1963. Chromosome number and classification in Hydrophyllaceae. Brittonia 15: 273-285.
Diane, N., H. Förther, & H.H. Hilger. 2002. A systematic analysis of Heliotropium, Tournefortia, and allied taxa of the Heliotropiaceae (Boraginales) based on ITS1 sequences and morphological data. Amer. J. Botany 89: 287-295
Ferguson, D.M. 1998. Phylogenetic analysis and relationships in Hydrophyllaceae based on ndhF sequence data. Systematic Botany 23: 253-268.
Hilger, H.H., and N. Diane. 2003. A systematic analysis of Heliotropiaceae (Boraginales) based on trnL and ITS1 sequence data. Bot. Jahrb. Syst. 125: 19-51.
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.
Khoshsokhan-Mozaffar, M., M. Sherafati, and S. Kazempour-Osaloo. 2018. Molecular phylogeny of the tribe Rochelieae (Boraginaceae, Cynoglossoideae) with special reference to Lappula. Annales Botanici Fennici 55: 293-308.
Nazaire, M., and L.E. Hufford. 2012. A broad phylogenetic analysis of Boraginaceae: implications for the relationships of Mertensia. Systematic Botany 37: 758-783.
Weigend et al. 2016. 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.
Wilson, K.A. 1960a. The genera of Hydrophyllaceae and Polemoniaceae in the southeastern United States. J. Arnold Arb. 41: 197-212.
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