Yet Another Step Toward Tripleness
With this balloon flower several of the stamens have turned into petals of a rudimentary type. If carefully selected, the progeny of this flower should, within a generation or two, have some representatives with three rows of fully formed petals, in striking contrast with the single-flowered parent-forms a few generations removed.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 10 Chapter 1