Historical clue formulations

• Angle between a leafstalk and a stem — 2018-01-24
• Angle in botany — 2012-05-04
• Botanical angle — 2009-10-07
• Botanical angle — 2008-11-09
• Leaf-to-branch angle — 2008-06-24
• Botanist's angle — 2007-11-10
• Botanist's angle — 1995-01-06
• Leaf angle — 1994-02-23