Historical clue formulations

• African tree with hanging fruit — 2018-12-29
• Thick-trunked tree — 2017-10-11
• With 25-Across, it has a huge trunk — 2013-06-15
• Thick-trunked African tree — 2012-07-24
• Tree that's home to Rafiki in "The Lion King" — 2010-06-18
• Monkey bread tree — 2005-06-22
• Tree with a gourdlike fruit — 2000-06-29
• Thick-trunked tree — 1999-10-10
• Thick-trunked tropical tree — 1997-05-26
• Its fruit is monkey bread — 1994-05-06
• Tropical African tree — 1994-01-02