Iowa Code § 633.275
A devise or bequest, the validity of which is determinable by the law of this state, may be made by a will to the trustee of a trust established, or to be established, by the testator, or by the testator and some other person or persons, or by some other person or persons, including a funded or unfunded life insurance trust, although the trustor has reserved some or all rights of ownership of the insurance contracts, if the trust is identified in the testator's will, and if its terms are set forth in a written instrument other than a will executed before or concurrently with the execution of the testator's will, or in the valid last will of a person who has predeceased the testator regardless of the existence, size, or character of the corpus of the trust. The devise or bequest is not invalid because the trust is amendable or revocable, or both, or because the trust was amended after the execution of the will or after the death of the testator. Unless the testator's will provides otherwise, the property so devised or bequeathed shall not be deemed to be held under a testamentary trust of the testator, but shall become a part of the trust to which it is given and shall be administered and disposed of in accordance with the instrument or will setting forth the terms of the trust, including any amendments thereto made before the death of the testator, regardless of whether any such amendment was made before or after the execution of the testator's will, and, if the testator's will so provides, including any amendments to the trust made after the death of the testator. A revocation or termination of the trust before the death of the testator causes the devise or bequest to lapse. This section does not invalidate a devise or bequest made by a will executed prior to January 1, 1964.
Iowa Code § 633.275
Referred to in §633.277