Good point.
Article 1, Section 1 of the Constitution _is_ the law of the land, and therefore, Roe v. Wade is not.
That is not what the Constitution says.
Article 1, Section 1 specifically states:
All legislative Powers herein granted shall be vested in a Congress of the United States, which shall consist of a Senate and House of Representatives.
And besides, the law of the land is what the Supreme Court says it is. Read Marbury vs Madison.