The American Naturalist, 56(42): 16-31 (Jan-Feb, 1922)
Variations in Datura Due to Changes in Chromosome Number (excerpt)
Albert Francis Blakeslee

The 12 mutants under discussion may best be represented in a single figure by their capsules. In Figure 4 we have capsules of the 12 simple trisomic mutants viewed from the ovate side, each one of which represents the addition of a single extra chromosome presumably in a different set. There is the Globe with depressed capsules and stocky spines; the large long-spined Poinsettia; the narrow short-spined Cocklebur; the slender-spined Ilex; the Mutilated, usually mutilated with a diseased blotch; the short-spined Sugarloaf; the shiny capsule of Glossy, etc., with lastly the narrow, long-spined Wedge. I have provisionally called these mutants the 12 apostles. Certain of the 12 have varieties which may be called acolytes, and perhaps some of these in the figure may be reduced from the rank of apostles to that of acolytes when other forms are discovered.

FIG. 4. Photographs of capsules of 12 mutants of Datura viewed from the ovate side.