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Clusters of Pentstemons

The pentstemons are exceedingly hardy and thrifty flowers of which there are many native species, as well as a good many foreign ones. There is a wide range of form and color so that the flower is a particularly attractive one for the experiments of the plant developer.

Clusters of Pentstemons

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 9 Chapter 5