anisomerous

Century Dictionary and Cyclopedia

1. In botany, unsymmetrical: applied to flowers which have not the same number of parts in each circle.
2. In odontography, having the transverse ridges of successive molar teeth increasing in number by more than one, as in the mastodons.

Wiktionary

1. adj. botany Having the number of floral organs unequal.

GNU Webster's 1913

1. adj. (Bot.) Having the number of floral organs unequal, as four petals and six stamens.