Yep, that's what I'm saying. I'm about 90% sure that there's at least one Druid spell where mistletoe is the component. Don't remember what it is, though. (And, to be honest, I don't even know if it was 3.0 or 3.5.
Well, I took a look. Of the Druid spells in 3.5 with M components that are not DF: Fire Seeds requires acorns or holly berries; Fire Seeds requires 25gp of gold dust; Ironwood requires shaped wood; Jump requires a grashopper leg; Longstrider a pinch of dirt; Move Earth requires a bag of mixed dirt; Spider Climb requires eating both a live spider and bitumen; Stoneskin requires granite and 250gp of diamond dust; Sympathy requires 1500gp of crushed pearls and a drop of honey; True Seeing requires 250gp of an ointment made of fat, mushrooms and saffron; Unhallow (yes, I know its an evil spell, but I'm including it for completeness) requires herbs & oils of 1000gp, +1000gp/spell level of spell linked to the base spell.
Oddly enough, Hallow, not only requires the same herbs & oils, but unlike its evil counterpart, requires a divine focus.
The spell you're thinking of may be a 3.0 spell.