Carlquist, Sherwin John, 1930-2021. [Ranunculus cortusifolius in Canary Islands], photograph, June 6, 1967; (https://texashistory.unt.edu/ark:/67531/metapth1639610/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .