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Lilium is the genus of true lilies, bulb-forming flowering plants. Its conspicuous reproductive structures make it useful for observing anthers, pollen and floral organization. Other plants called lilies in everyday language need not belong to this genus.

plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=gn&name=Lilium. Institutional generic description of Lilium, including its six tepals.