PITTSBURGH — The mayors of the Super Bowl cities have made their wager: a tree vs. a tree — of sorts.

Mayor Luke Ravenstahl, who has taken to calling himself Steelerstahl since the Pittsburgh Steelers beat the Baltimore Ravens to advance to Sunday's Super Bowl, has accepted the bet offered by Glendale Mayor Elaine Scruggs.

If the Steelers win, Glendale officials must plant a tree native to Pennsylvania outside University of Phoenix Stadium, home of the Arizona Cardinals. If the Cardinals win, Ravenstahl must see that a cactus is planted outside of Heinz Field, where the Steelers play.

Pittsburgh's mayor is explaining the bet this way: "Pittsburgh is a city of trees, so we're betting a tree for a tree, even though theirs is a cactus."