tree
朳 is a rare kanji whose standalone meaning is unclear. The given gloss 'tree' likely relates to its wood radical, but the character is not used independently in modern Japanese.
The exact historical development of 朳 is uncertain. It combines 木 (tree) with 八, but the role of 八 is unclear.
A tree 木 with a split 八 shape beside it: imagine a tree that has been cut into two parts, but the character itself is rarely used.
For ハツ, imagine a hat caught in the branches of the tree: hat -> ハツ, and the tree holds it.