(UN-1 12.)
1867. Spencer, Principles of Biol., II. 129. Each member of a plant will display … unsymmetry or asymmetry where there is partial or entire departure from a balance of surrounding actions.
1867. J. M. Wilson, in Farrar, Ess. Lib. Educ., 274. The pelargonium, and its more visible unsymmetry.
