I think the humble identify spell tells so. Don't hold me to this.
While we stand on the topic of staves and wands, look at the spell I dug up in an obscure corner (Mintiper's Chapbook) of Mages of the Beach's website:
The Hamagess' Staffsprout
Transmutation
Level: Brd 6, Sor/Wiz 6
Components: V, S, M
Casting Time: 1 minute
Range: Touch
Target: One magical staff
Duration: Instantaneous
Saving Throw: Will negates
Spell Resistance: Yes
You cause a branch to sprout from a magic staff and direct any one arcane spell of 4th level or less contained within the staff into the branch. Once the branch is broken off, it acts as a wand with one charge, capable of casting that one arcane spell with a caster level equal to that of the magic staff.
The staff must contain a number of charges equal to at least one plus the number of charges needed to cast the selected spell or the spell is wasted. Casting this spell drains the number of charges needed to cast the selected spell. If the branch is not broken off within ten minutes of the casting of this spell, it crumbles to dust, wasting both the spell and the charges expended to create the branch.
Material Component: A magical staff standing in at least an inch of water.
Cool, huh?