The "Gravity" Cactus
This very commendable member of Mr. Burbank's spineless colony has been named the "Gravity." The name was suggested by the fact that many of the slabs tend to assume a perpendicular position, as if they were suspended by invisible wires and under influence of gravity. A plant of this kind grows about the largest possible number of slabs on a given area.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 8 Chapter 7