Spanish Broom Bush
This compact, upright, ornamental shrub, is known to the botanist as Spartium junceum. It is a thrifty shrub, but unfortunately not very hardy. In any region where it can be grown, it should be prized as a garden ornament. Mr. Burbank has developed the plant by selective breeding.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 10 Chapter 8