[Echium decaisnei from Tafira Alta, Canary Islands], photograph, 1967; (https://texashistory.unt.edu/ark:/67531/metapth1646057/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
[Echium decaisnei from Tafira Alta, Canary Islands], photograph, 1967; (https://texashistory.unt.edu/ark:/67531/metapth1646057/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .