Historical clue formulations

• Shrub with a "staghorn" variety — 2025-07-25
• "Poison" shrub — 2024-06-04
• Poison ___ — 2020-11-30
• Shrub that produces a crimson-colored spice — 2020-07-26
• Poison ___ — 2019-04-25
• Shrub that might cause a rash — 2019-04-16
• Poison ___ — 2018-05-02
• Poison ___ — 2017-09-08
• Plant used in tanneries — 2016-08-13
• Poison oak cousin — 2016-05-24
• Poison ___ — 2014-11-12
• Poison ___ — 2014-04-30
• Shrub that produces a crimson-colored spice — 2014-03-21
• Tree whose leaves were once smoked by Indians — 2012-06-22
• Rash-causing shrub — 2012-04-18
• "Poison" shrub — 2012-02-15
• Cause of a rash reaction? — 2010-11-06
• Shrub that may cause a severe allergic reaction — 2009-10-18
• Cause of a rash response? — 2009-10-17
• Cashew family member — 2007-07-21
• Cashew family member — 2006-01-15
• Poison plant — 2005-08-25
• Poisonous plant — 2004-05-02
• Shrub with red fruit — 2003-09-22
• It can be poisonous — 2001-06-28
• Poison plant — 1999-07-14
• Tree with tiny red berries — 1999-01-17
• Tannin source — 1998-12-05
• Poison ___ — 1997-11-18
• Squawbush, e.g. — 1996-06-14
• Scratchy shrub — 1994-12-30