Historical clue formulations

• Plant bristle — 2021-03-15
• Bristle of grain — 2020-05-24
• Barley beard — 2016-10-31
• Wheat bristle — 2015-01-21
• Grain beard — 2013-09-17
• Plant bristle — 2013-05-19
• The "needle" part of needle grass — 2013-04-05
• Beard of botany — 2012-11-16
• Plant bristle — 2012-08-14
• Beard growing out of an ear — 2012-06-02
• Bristle on barley — 2011-10-25
• Barley bristle — 2010-04-28
• Plant bristle — 2009-09-03
• Foxtail feature — 2008-07-30
• Natural bristle — 2008-07-20
• Botanist's beard — 2007-07-20
• Bristle — 2007-03-29
• Natural bristles — 2006-10-29
• Wheat beard — 2006-09-07
• Grass part — 2006-03-04
• Beard of barley — 2005-08-17
• Plant bristle — 2005-05-05
• Wheat covering — 2004-03-14
• Barley bristle — 2003-12-23
• Bristle — 2003-10-02
• Barley bristle — 2000-11-28
• Bristle — 2000-10-15
• Wheat or barley covering — 2000-02-07
• Grass part — 1999-12-03
• Barley beard — 1998-12-24
• Botanical beard — 1998-09-13
• Wheat part — 1997-12-28
• Bristle on barley — 1997-10-30
• Barley bristle — 1995-12-21
• Barley beard — 1995-09-03
• Grain bristle — 1995-08-30
• Bristle — 1995-05-07
• Wheat stalk part — 1994-11-20
• Barley beard — 1994-11-03
• Barley bristle — 1994-08-02
• Cereal bristle — 1994-03-01
• Barley beard — 1994-01-18
• Beard of grain — 1993-11-28