Echium masguindalii Echium abdelrhamanii Echium augustini Echium briquetii Echium confusum Echium decipiens Echium espagnolis Echium hispidissimum Echium horrendum Echium jahandiezii Echium maireanum Echium ortizii Echium paniaguae Echium perplexans Echium proditorum Echium pulchrum Echium riofrioi Echium tercianum
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024