Revising...
Jaws (Ex): Each of a giant venus fly-trap's jaws may make a single bite attack each round. It a jaw hits with its bite attack, the fly-trap can then attempt to start a grapple as a free action without provoking an attack of opportunity. If it wins the grapple check, it establishes a hold and can attempt to swallow the foe the following round. A jaw enganged in a grapple cannot make a bite attack, but the giant venus fly-trap is not considered grapple.
With each of its jaws, a giant venus fly-trap can try to swallow a single grabbed opponent of a smaller size than itself by making a successful grapple check. Once inside, the opponent takes 1d6+5 points of crushing damage plus 5 points of acid damage per round from the plant's fluids. A swallowed creature can cut its way out by using a light slashing or piercing weapon to deal 10 points of damage to the jaws (AC 12), destroying that set of jaws (and dealing 5 points of damage to the fly-trap) in the process.
An opponent not currently swallowed can attack a giant venus fly-trap's jaws with a sunder attempt as if they were weapons. A giant venus fly-trap's jaws have 10 hit points each. If a giant venus fly-trap is currently grappling a target with the jaw that is being attacked, it usually uses another jaw to make its attack of opportunity against the opponent making the sunder attempt. Severing one of a giant venus fly-trap's jaws deals 5 points of damage to the creature. The creature regrows severed jaws in 1 week.