Is this incorrect, then?
From Wikipedia
On February 25, 1913, the Republican Secretary of State Philander Knox proclaimed that the 16th Amendment had been ratified by the necessary three-quarters of the states ensuring the constitutionality of unapportioned federal income taxes.
The amendment was ratified by 42 states in all: Alabama on August 10, 1909, Kentucky on February 8, 1910, South Carolina on February 19, Illinois on March 1, Mississippi on March 7, Oklahoma on March 10, Maryland on April 8, Georgia on August 3, Texas on August 16, Ohio on January 19, 1911, Idaho on January 20, Oregon on January 23, Washington on January 26, Indiana and Montana on January 30, California and Nevada on January 31, South Dakota on February 3, Nebraska on February 9, North Carolina on February 11, Colorado on February 15, North Dakota on February 17, Kansas on February 18, Michigan on February 23, Iowa on February 24, Missouri on March 16, Maine on March 31, Tennessee on April 7, Arkansas on April 22, Wisconsin on May 26, New York on July 12, Arizona on April 6, 1912, Minnesota on June 11, Louisiana on June 28, West Virginia on January 31, 1913, New Mexico on February 3 (the 36th state to ratify), Delaware and Wyoming on February 3, New Jersey on February 4, Vermont on February 19, Massachusetts on March 4, and New Hampshire on March 7. Arizona and New Hampshire ratified after an earlier rejection. Ratification was rejected by Rhode Island on April 29, 1910, Utah on March 9, 1911 Connecticut on June 28, 1911, and Florida on May 31, 1913. Virginia and Pennsylvania failed to complete action on the amendment.[8]