The Texas Barberry
This shrub differs very markedly in appearance from the one shown in the preceding picture. Interesting results may be expected when the strains of the two are blended through hybridization. By combining the strains of divergent species such as these, Mr. Burbank has attained some of his most notable results.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 6 Chapter 8