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As far as I've interpreted the rules, you can trip with ANY MELEE weapon, but doing so constitutes an AoO unless its specifically a Trip weapon or you have Improved Trip feat. You would also incur not being able to drop a weapon if you fail unless its a designed to do it.
Improved Trip (Combat)
You are skilled at sending your opponents to the ground.
Prerequisite: Int 13, Combat Expertise.
Benefit: You do not provoke an attack of opportunity when performing a trip combat maneuver. In addition, you receive a +2 bonus on checks made to trip a foe. You also receive a +2 bonus to your Combat Maneuver Defense whenever an opponent tries to trip you.
Normal: You provoke an attack of opportunity when performing a trip combat maneuver.
Trip: You can use a trip weapon to make trip attacks. If you are tripped during your own trip attempt, you can drop the weapon to avoid being tripped.
The way I see it, you can trip with a staff, a sword, a club. Within reason. I mean a rapier I can't really see, but yeah a falchion maybe. They aren't designed persay to be used that way, but its possible that you could have the strength (and luck) to hit someone in a knee cap or thigh or something to throw them off balance. Its just harder to do.
Just my 2c.