Even though the name of the group is ... Bulb Society, I have always thought of it as really ... Geophyte Society; others may not agree. I guess, too, that not every member would agree to what a geophyte is. I take Geophyte sensu latu to mean any plant with a typically (but not necessarily) underground, specialized storage organ composed of stemlike or leaflike material, upon which it relies when it resumes active growth after its dormancy or for the production of its inflorescence when it's not green. Not all bulbous or rhizomatous plants qualify as Geophytes s.s. but I think they'd be fair game for our society. As I say -- others may not agree.