Okla. Stat. tit. 60, § 60-31: Suspension of alienation

A. The absolute power of alienation shall not be

suspended, by any limitation or condition whatever, for a

longer period than during the continuance of the lives of

persons in being at the creation of the limitation or

condition plus twenty-one (21) years, except as provided

in Section 34 of Title 60 of the Oklahoma Statutes.

B. The provisions of this section apply solely to real property

not held in trust.