Ok, it reads as:
Bramble Armor (Su): At 6th level, you can cause a host of wooden thorns to burst from your skin as a free action. While bramble armor is in effect, any foe striking you with an unarmed strike or a melee weapon without reach takes 1d6 points of piercing damage + 1 point per two cleric levels you possess. You can use this ability for a number of rounds per day equal to your cleric level. These rounds do not need to be consecutive.
If I (a half-orc) am fighting an Ogre armed with an ogre hook I know that when he is 10 feet away and striking me that he takes no Bramble damage.
However, if he is 5 feet away and we are beating on each other does he take the Bramble Damage? I would think so as he is not using his 10 foot reach (for being Large) and he is not using a weapon with reach ability. Under weapon descriptions ogre hook does not have it listed under special abilities.
I ask as we are starting to face ogres and giant in Runlords and this situation will come up a lot.