From The New York Times of October 11, 1912: The wedding of Miss Rowena Stewart, daughter of Mr. and Mrs. Charles A. Stewart of San Francisco to Walter Barnum, a son of Mr. and Mrs. William M. Barnum of this city and Mamaroneck, took place at the Brick Presbyterian Church yesterday afternoon.
Walter and Rowena Barnum had one son, Burrall Barnum, born October 17, 1913 in New York City. They divorced and Walter remarried. The name of his second wife is not known, but they had at least two sons.
California Death Records indicate that Rowena S. Barnum was born 8/20/1890 in Illinois and died in Santa Barbara County on 8/30/1972.