Navarro, T., and B. Cabezudo. “The Inflorescence in Species of the Genus Teucrium L. (Lamiaceae) Present in the Iberian Peninsula and the Balearic Islands”. Acta Botanica Malacitana, vol. 20, Dec. 1995, pp. 165-71, doi:10.24310/abm.v20i.8847.