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