Gosh, in elementary school I was taught that a tuber is a stem, not a root. Of course, the only tubers that New York City schoolchildcren were likely to be familiar with were potatoes, where the tuber is a stem -- I think. David E. ________________________________ From: Peter Taggart <petersirises@gmail.com> To: Pacific Bulb Society <pbs@lists.ibiblio.org> Sent: Mon, June 4, 2012 4:39:43 AM Subject: Re: [pbs] Musa corms I was taught that a tuber is a swollen root and that a rhizome is a swollen stem.