Historical clue formulations

• Plants with bell-shaped blooms — 2017-09-03
• Mariposa relatives — 2015-01-30
• Liliaceous plants — 2007-12-01
• Utah lilies — 2006-04-09
• Bell-shaped flowers — 1999-01-14
• Lily plants — 1998-11-03
• Utah lilies — 1997-11-27
• Some lilies — 1997-01-25
• Utah lilies — 1995-11-22
• Lilies — 1994-12-19