Historical clue formulations

• Herb resembling spinach — 2018-03-11
• Leafy plant also called mountain spinach — 2015-09-10
• Spinachlike plant — 2008-07-13
• Spinachlike plant — 2006-12-07
• Spinachlike plant — 2006-04-16
• Spinachlike plant — 2001-11-04
• Spinachlike plant — 1999-03-10
• Goosefoot family herb — 1994-11-18