Watson, L. and M. J. Dallwitz. 1992 onwards. Boraginaceae Juss.Archived July 1, 2005, at the Wayback Machine The Families of Flowering Plants. Version: 19 August 2013.
Buys, Matt H.; Hilger, Hartmut H. (2003). "Boraginaceae Cymes Are Exclusively Scorpioid and Not Helicoid". Taxon. 52 (4): 719–724. doi:10.2307/3647346. ISSN0040-0262. JSTOR3647346.
Buys, Matt H.; Hilger, Hartmut H. (2003). "Boraginaceae Cymes Are Exclusively Scorpioid and Not Helicoid". Taxon. 52 (4): 719–724. doi:10.2307/3647346. ISSN0040-0262. JSTOR3647346.
Watson, L. and M. J. Dallwitz. 1992 onwards. Boraginaceae Juss.Archived July 1, 2005, at the Wayback Machine The Families of Flowering Plants. Version: 19 August 2013.
Buys, Matt H.; Hilger, Hartmut H. (2003). "Boraginaceae Cymes Are Exclusively Scorpioid and Not Helicoid". Taxon. 52 (4): 719–724. doi:10.2307/3647346. ISSN0040-0262. JSTOR3647346.