Boraginoideae

Boraginoideae is a subfamily of the flowering plant family Boraginaceae "s.s", with about 42 genera. That family is defined in a much broader sense (Boraginaceae s.l.) in the Angiosperm Phylogeny Group (APG) system of classification for flowering plants. The APG has not specified any subfamilial structure within Boraginaceae "s.l."
Taxonomy.
Some taxonomists placed the genera "Codon" and "Wellstedia" in Boraginoideae. Others place one or both of these in separate, monogeneric subfamilies. "Codon" was long regarded as an odd member of Hydrophylloideae, but in 1998, a molecular phylogenetic study suggested that it is closer to Boraginoideae. Neither is included n more modern classifications.
Some authors proposed a revision of earlier APG systems, in which Boraginaceae had been included as an unplaced family (i.e. not included in a specified order) within the lamiid clade of eudicots. In that system. Boraginaceae was defined broadly (Boraginaceae "sensu lato" or "s.l."). Instead they proposed recognizing five to eight families in a separate order, the Boraginales. In that system Boraginaceae is treated in a narrow sense ("sensu stricto" or "s.s."). Subsequently the order Boraginales was added to the 2016 revision (APG IV) to include Boraginaceae at the ordinal level, in which it was the sole family. The consensus was to continue the broad usage rather than split it into separate families, based on its monophyletic composition. The subfamilial structure applies solely to Boraginaceae "s.s.", which includes around 1,600 to 1,700 species divided into some 90 genera.
Subdivision.
Comparisons of DNA sequences by cladistic methods suggested the division of Boraginoideae into four tribes: Echiochileae, Boragineae, Lithospermeae, and Cynoglosseae. This was subsequently resolved into only two tribes, Boragineae and Lithospermeae (25 genera). Boragineae was then further subdivided into two subtribes, Boragininae (15 genera) and Moritziinae (2).
Genera.
Genera and approximate number of species in the system of Chacon et al (2016): 
"Anchusa", "Anchusella", "Borago", "Brunnera", "Cynoglottis", "Gastrocotyle", "Hormuzakia", "Lycopsis", "Melanortocarya", "Nonea", "Pentaglottis", "Phyllocara", "Pulmonaria", "Symphytum", "Trachystemon"
"Moritzia", "Thaumatocaryon" 
"Aegonychon", "Alkanna", "Ancistrocarya", "Arnebia", "Buglossoides", "Cerinthe", "Cystostemon", "Echiostachys", "Echium", "Glandora", "Halacsya", "Huynhia", "Lithodora", "Lithospermum", "Lobostemon", "Maharanga", "Mairetis", "Moltkia", "Moltkiopsis", "Neatostema", "Onosma", "Paramoltkia", "Podonosma", "Pontechium", "Stenosolenium"
The following list of genera consists of "Codon" plus the genera listed for Boraginoideae at the Germplasm Resources Information Network