Historical clue formulations

• Some pod-bearing trees — 2025-09-30
• Common trees in Australia — 2024-11-13
• Knobthorns and wattle trees — 2005-12-11
• Yellow-flowered shrubs — 2004-09-04
• These yield gum arabic — 1997-05-17
• Gum arabic sources — 1995-12-09
• Gum arabic trees — 1994-07-18